Cesarean Section

This study aims to compare the effect of ondansetron lozenge and intravenous for prevention of shivering in cesarean section (CS).

Some patients who undergo cesarean section under spinal or epidural anesthesia can experience severe pain. Some patients who experience this kind of pain can experience symptoms of post-traumatic stress disorder (PTSD) after pregnancy. Currently, the two main options for treating this pain are general anesthesia (full medically induced unconsciousness) and using intravenous medications to reduce the pain and decrease anxiety. The EAGLET-CS Pilot is a pilot randomized trial that will test the feasibility of comparing the impact of these two options for preventing PTSD in a rigorous way for those patients who experience pain during their cesarean section after the baby is out.

Background: Carbetocin is an established single-dose uterotonic agent for postpartum hemorrhage prophylaxis at elective cesarean delivery. Despite its proven efficacy, many clinicians routinely add a supplemental oxytocin infusion following carbetocin administration without evidence-based justification. Concurrent oxytocin receptor stimulation may be redundant, counterproductive through receptor desensitization, or incrementally beneficial - a mechanistic uncertainty that remains unresolved in the published literature. Objectives: To determine whether carbetocin monotherapy (100 micrograms IV bolus plus placebo infusion) is non-inferior to carbetocin plus supplemental oxytocin infusion (10 IU over 4 hours) in preventing the need for additional uterotonic agents within 24 hours of elective cesarean delivery. Study Design: Prospective, randomized, double-blind, placebo-controlled, non-inferiority trial with an integrated pilot phase. Phase 1 (Pilot, n=60) establishes local feasibility and event rate. Phase 2 (Full trial, n=332) provides the definitive non-inferiority analysis. Participants: Women aged 18-45 years undergoing elective cesarean delivery under spinal anesthesia at Qassim University Medical City, singleton pregnancy at or beyond 37 weeks, ASA physical status II, preoperative hemoglobin 9 g/dL or more. Interventions: Group C (Monotherapy): Carbetocin 100 micrograms IV bolus plus placebo saline infusion 500 mL over 4 hours. Group C+O (Combination): Carbetocin 100 micrograms IV bolus plus oxytocin 10 IU in 500 mL saline over 4 hours. Primary Outcome: Proportion of patients requiring at least one additional uterotonic agent within 24 hours of delivery. Secondary Outcomes: Quantitative intraoperative blood loss by gravimetric measurement; total 24-hour blood loss; actual blood loss by Gross formula; hemoglobin and hematocrit changes; uterine tone scores by verbal numerical rating scale (0-10) at 2, 5, and 10 minutes; incidence of postpartum hemorrhage; blood transfusion requirement; hemodynamic profiles; adverse effects. Sample Size: 332 patients (166 per group), non-inferiority margin 10 percentage points, one-sided alpha 0.025, 80% power, estimated baseline event rate 10%, with 15% dropout allowance.

During standard cesarean deliveries, there are two ways that obstetricians repair the incision on the uterus (hysterotomy after delivery of the baby. One method involves lifting the uterus out of its regular place in the abdomen to repair the incision (uterine exteriorization for repair). The second method involves leaving the uterus inside the abdomen to repair the uterus (in situ repair). Both of these methods are regularly used by obstetricians during cesarean deliveries, and it is not currently known if one has benefits over the other. Currently, surgeons use both methods, but lifting the uterus out of its place is slightly more common. In this study, participants will be randomly assigned to have one of these techniques performed during their surgery. Researchers will be investigating whether one technique or the other leads to better contraction of the uterus after delivery, less bleeding, less intra-operative nausea/vomiting, or a better patient experience than another.

This single-center randomized controlled clinical trial will evaluate the effects of structured early postpartum mother-infant skin-to-skin contact, with or without maternal lavender aromatherapy, after elective cesarean section on maternal stress biomarkers and early breastfeeding outcomes. The study will enroll 150 term pregnant women scheduled for elective cesarean section under spinal anesthesia at Ataturk University Research Hospital. Participants will be randomized into three groups: routine postoperative care, structured skin-to-skin contact, and structured skin-to-skin contact combined with inhalational lavender aromatherapy. The primary outcome is the change in maternal salivary cortisol level from immediately after birth to 60 minutes postpartum. Secondary outcomes include maternal salivary IgA levels, state anxiety scores, postoperative pain and nausea, time to first analgesic requirement, early breastfeeding initiation and success, LATCH scores, neonatal axillary temperature, cumulative duration and continuity of skin-to-skin contact, maternal satisfaction, and the need for mother-infant separation within the first 2 hours postpartum.

Using spinal or epidural anesthesia (known as neuraxial blocks) is the gold standard for pain control during childbirth, especially in cesarean sections (C-sections). However, many women experience moderate to severe pain after a C-section, which can affect both their physical and emotional well-being, and even impact their ability to care for their newborn. Unfortunately, this pain is often not treated effectively, which can lead to increased sensitivity to pain or even chronic postoperative pain. One effective way to manage this pain is by giving opioids directly into the spinal fluid (subarachnoid space). This method allows doctors to use much smaller doses than would be needed if the same medication were given through a vein, which also helps avoid many of the common side effects of opioids like respiratory depression, nausea, pruritus, and constipation. Common opioids used in this setting include fentanyl, sufentanil, and morphine. These drugs behave differently depending on their chemical properties. For example, drugs that are more fat-soluble work faster, while those that are less fat-soluble tend to last longer. Morphine, which is less fat-soluble than the others, provides strong and long-lasting pain relief. When injected spinally, its effect can last 18-24 hours, with the pain relief starting 1-2 hours after the injection. Its performance is comparable to that of epidural anesthesia or nerve blocks. Researchers have studied a wide range of spinal morphine doses (from 20 to 500 micrograms) to find the most effective and safest dose. Most of these studies are small or use set doses without clear reasoning. Recently, a method called sequential allocation has become popular for finding the best dose more accurately. About the Study This research aims to find the ideal dose of spinal morphine when it's given with a fixed amount of fentanyl and varying doses of ropivacaine (a local anesthetic) during spinal anesthesia for C-section in healthy full-term parturients. The goal is to find the dose that provides adequate analgesia (pain score under 3 out of 10) for at least 12 hours after surgery. This is a prospective, non-randomized, double-blind study. The study follows ethical standards and all participants sign an informed consent form. Two anesthesiologists are involved in each case: one handles the spinal injection and dose decision (based on the previous patient's response), while the other monitors the patient and collects the data without knowing the dose used. Anesthetic Technique Spinal anesthesia is done using standard procedures. A very fine needle (25 or 27 gauge) is used to inject a mixture of fentanyl (15 mcg), a variable dose of ropivacaine (based on somatometrics), and a variable dose of morphine (based on the algorithm). The mixture is injected slowly (1 ml every 10 seconds), with the needle facing toward the head. After surgery, all women receive additional pain medications like paracetamol and NSAIDs as part of a multimodal pain relief approach. How the Morphine Dose is Decided The dose of morphine changes based on whether the previous participant had effective pain relief. Pain relief is considered successful if the pain score stays at or below 3 (on a 0-10 scale) for at least 12 hours after the spinal injection. For the first woman in the study, the starting dose is chosen based on published research. Then: * If the previous participant had good pain control (NRS ≤3 for 12 hours), the dose for the next woman is reduced by 20 micrograms. * If pain control was poor (NRS \>3 within the first 12 hours), the dose is increased by 40 micrograms. This up-and-down adjustment continues for each new participant.

This is a multicenter, 1:1 parallel-group, randomized controlled trial designed to compare the effect of the Enhanced Recovery After Cesarean (ERAS) protocol versus standard perioperative care on mother-infant and father-infant bonding in women undergoing cesarean delivery. The study will initially be conducted as a single-center trial at Istanbul Okan University Hospital. Once adequate site preparation is completed, additional centers will be added to expand the study to a multicenter setting. Primary Outcome: The primary outcome is the total score on the Postpartum Bonding Questionnaire (PBQ) assessed on postpartum day 7, reflecting mother-infant bonding. Secondary Outcomes: Secondary outcomes include: Maternal/Parental Postnatal Attachment Scale (MIBS) score at 2 hours postpartum (mother) PBQ score at 24 hours postpartum (mother) PBQ score at day 4 postpartum (mother) PBQ score at day 7 postpartum (father-infant bonding) Edinburgh Postnatal Depression Scale (EPDS) scores for mothers at 2 hours and 7 days postpartum Time to initiation of breastfeeding Requirement for neonatal intensive care unit (NICU) admission Sample Size: The total multicenter target sample size is n=300, with 150 participants in the ERAS group and 150 in the standard care group. The initial single-center phase at Okan University Hospital will enroll a target of n=100 participants (50 per group). Randomization: Participants will be randomized using a block and stratified randomization approach based on parity (primiparous vs multiparous) and planned type of anesthesia. Blinding (Masking): Due to the nature of the intervention, care providers cannot be blinded to group assignment. However, outcome assessors and data analysts will remain blinded to treatment allocation to minimize bias. Study Timeline and Visits: Participants will be evaluated at multiple time points following cesarean delivery: 2 hours postpartum, 24 hours postpartum, day 4 postpartum, and day 7 postpartum. All primary and secondary outcomes will be collected at the specified time points. Significance and Rationale: The ERAS protocol for cesarean delivery is designed to optimize perioperative care, enhance recovery, and potentially improve early parent-infant bonding. While previous studies have focused on maternal recovery and clinical outcomes, evidence regarding the impact of ERAS on both mother-infant and father-infant bonding remains limited. This trial aims to provide high-quality evidence on whether ERAS implementation can improve early bonding experiences, maternal mental health, breastfeeding initiation, and neonatal outcomes compared with standard perioperative care. The findings may guide future clinical practice and contribute to optimizing family-centered care in cesarean deliveries. Key Features: Multicenter, randomized controlled design Parallel 1:1 allocation Stratified randomization by parity and anesthesia type Blinded outcome assessment and data analysis Multiple postpartum evaluation points Focus on psychosocial and clinical outcomes Expected Contributions: This study will provide comprehensive data on the feasibility and effectiveness of ERAS protocols in cesarean deliveries and their potential benefits for both maternal and paternal bonding with the newborn. The inclusion of both mother-infant and father-infant outcomes, as well as maternal mental health and breastfeeding indicators, ensures a holistic assessment of early family-centered outcomes.

Cesarean section is a common surgical procedure performed to deliver a baby when vaginal birth may pose risks to the mother or infant. Although it is often life-saving, recovery after cesarean section is frequently associated with multiple physical and psychological challenges, including postoperative pain, delayed gastrointestinal function, reduced mobility, fatigue, and decreased overall well-being. These factors may negatively affect a woman's ability to care for her newborn, initiate breastfeeding, and adapt to the postpartum period. In recent years, there has been increasing interest in non-pharmacological interventions that can safely support postoperative recovery without causing additional side effects. Among these, music therapy, breathing exercises, and virtual reality applications have been identified as promising approaches. Music therapy may promote relaxation and reduce pain and anxiety through auditory stimulation and emotional regulation. Breathing exercises may enhance parasympathetic activity, improve oxygenation, reduce stress, and support gastrointestinal motility. Virtual reality applications, by providing immersive audiovisual experiences, may reduce pain perception, decrease anxiety, and improve overall comfort through distraction and relaxation mechanisms. Although these interventions have individually demonstrated beneficial effects in postoperative care, the existing literature is limited in directly comparing their relative effectiveness within the same study design. Furthermore, most studies have primarily focused on pain outcomes, while other important aspects of recovery, such as obstetric recovery quality and gastrointestinal symptoms, have received less attention. This randomized controlled trial aims to comparatively investigate the effects of music therapy, breathing exercises, and virtual reality application on obstetric recovery, pain, and gastrointestinal symptoms in women following cesarean section. Participants will be randomly assigned to one of three intervention groups or a control group receiving routine care. Standardized protocols will be applied for each intervention to ensure consistency. The primary outcomes of this study include obstetric recovery, pain intensity, and gastrointestinal symptoms. By evaluating these outcomes simultaneously, the study aims to provide a more comprehensive understanding of post-cesarean recovery. The findings of this study are expected to contribute to evidence-based clinical practice by identifying effective, safe, and feasible non-pharmacological interventions that can be integrated into routine post-cesarean care. Ultimately, this research may help improve maternal comfort, accelerate recovery, and enhance the overall postpartum experience for women undergoing cesarean section.

The goal of this clinical trial is to determine whether suzetrigine increases the proportion of patients who remain completely opioid-free from completion of surgery through 72 hours after cesarean delivery. The main question it aims to answer is: Does adjunctive suzetrigine, when added to a standardized multimodal postoperative analgesic regimen, increase the proportion of patients who remain opioid-free during the first 72 hours after cesarean delivery? Researchers will compare suzetrigine to a placebo (a look-alike substance that contains no drug) to evaluate this outcome. Participants will: * Receive either suzetrigine or placebo after cesarean delivery * Receive standard postoperative pain management, including acetaminophen, nonsteroidal anti-inflammatory drugs, and neuraxial morphine * Have opioid medications available as needed for breakthrough pain * Be followed during hospitalization and after discharge to assess pain, recovery, and medication use

Preoperative anxiety is a common problem in patients undergoing elective cesarean section and may negatively affect perioperative outcomes through activation of the stress response, including increased cortisol levels. Effective preoperative information is considered a key non-pharmacological strategy to reduce anxiety; however, the optimal method of information delivery remains unclear. This prospective randomized controlled trial aims to compare the effects of video-based versus verbal preoperative information on anxiety levels and serum cortisol response in patients scheduled for elective cesarean delivery under spinal anesthesia. Anxiety will be assessed using the State-Trait Anxiety Inventory (STAI), and serum cortisol levels will be measured before and after the intervention. The findings of this study are expected to provide evidence for improving patient-centered preoperative education strategies in obstetric anesthesia."

The goal of this clinical trial is to investigate the differences in microbiota, height and weight between infants born by cesarean section and randomized to receive fecal microbiota transplant after birth. The main questions it aims to answer are: * Could micobiota transplant be used improve gut microbiota and prevent overweight or obesity. * Is the source of colonization a modifiable factor and can it be changed by using an early fecal microbiota transplant.

Spinal anesthesia is the most commonly used anesthetic technique for cesarean section in developed countries, but vasodilation and a decrease in systemic vascular resistance caused by sympathetic blockade result in hypotension in 7-74% of parturients. The fetus receives oxygen from the mother via uteroplacental blood flow, and because uteroplacental circulation during pregnancy has minimal autoregulation, uterine blood flow changes in proportion to maternal blood pressure. Therefore, a reduction in uterine blood flow due to maternal hypotension can lead to fetal hypoxia or acidosis and is associated with low Apgar scores after birth. Oxygen administration may offer potential benefits, such as improving maternal cerebral perfusion and preventing fetal ischemic injury, and thus low-flow oxygen via a conventional nasal cannula is commonly used. However, there are few studies evaluating the effects of high-flow oxygen administration on fetal well-being during cesarean section under spinal anesthesia. Low-flow oxygen delivery through a conventional nasal cannula, which is commonly used during cesarean section under spinal anesthesia, results in a fraction of inspired oxygen (FiO₂) of less than 40% due to dilution with ambient air. In contrast, OptiFlow THRIVE (Fisher and Paykel Healthcare, Panmure, Auckland, New Zealand) is a device capable of delivering high-flow oxygen through a nasal interface, allowing administration of 100% oxygen to the mother and potentially providing greater protection against fetal ischemic injury. Delivering non-humidified oxygen at flow rates above 10 L/min causes significant discomfort in awake patients, but OptiFlow THRIVE passes the gas through a heated humidification chamber immediately before delivery, enabling the administration of warmed and humidified oxygen even at high flow rates. Therefore, this study aims to compare high-flow nasal cannula oxygen therapy initiated upon operating room admission with conventional low-flow nasal cannula oxygen therapy during cesarean section under spinal anesthesia, assessing their effects on maternal hemodynamic parameters and, ultimately, on fetal acid-base status.

This prospective observational study investigates the predictive value of anthropometric and hemodynamic indices for spinal anesthesia-induced hypotension (SAIH) during cesarean section. While spinal anesthesia is preferred for its rapid onset, SAIH remains a frequent complication risking maternal and fetal safety. The study enrolled parturients at Erciyes University, excluding those with hypertension or extreme weight/height. Preoperative measurements included BMI, waist circumference (WC), body roundness index (BRI), and modified shock index (MSI). Following standardized spinal anesthesia with hyperbaric bupivacaine (Harten's dosage), hemodynamic parameters and sensory block levels were monitored. This research aims to determine whether BRI and WC offer superior predictive utility compared with conventional markers such as BMI and MSI to enhance individualized risk assessment in obstetric anesthesia.

Spinal anesthesia-induced hypotension is one of the most frequent and clinically significant complications of obstetric anesthesia, occurring in up to 50-80% of parturients undergoing elective cesarean section. Preoperative anxiety has been shown to potentiate hemodynamic instability through autonomic nervous system activation, thereby increasing susceptibility to spinal hypotension. This prospective, randomized, controlled trial aims to evaluate the effect of a standardized 5-minute mindfulness-based breathing exercise administered immediately prior to spinal anesthesia on the hemodynamic response in pregnant women scheduled for elective cesarean section. Eligible participants will be randomized in a 1:1 ratio into two parallel groups: the Mindfulness-Based Breathing Exercise Group and the Control Group receiving standard preoperative care. The breathing intervention consists of slow diaphragmatic breathing at a rate of approximately 6 breaths per minute (4-second inhalation through the nose, 6-second exhalation through the mouth), guided by a standardized script delivered by a trained anesthesiologist or nurse. Participants in the intervention group will be instructed to silently repeat the phrase "My body is relaxing as I exhale" with each exhalation, incorporating a mindfulness component. The primary outcome is the maximum decrease in systolic arterial pressure (SAP) within the first 10 minutes following spinal anesthesia induction. Secondary outcomes include preoperative state anxiety scores (STAI-5), early spinal hypotension incidence, heart rate changes, and vasopressor requirements. The study will be conducted at Atatürk University Faculty of Medicine, Department of Anesthesiology and Reanimation, Erzurum, Turkey, in accordance with the Declaration of Helsinki and Good Clinical Practice guidelines.

This prospective, single-center observational study aims to evaluate the predictive value of the internal jugular vein collapsibility index (IJVCI) for spinal anesthesia-associated hypotension in preeclamptic parturients (gestational age ≥28 weeks) undergoing cesarean delivery classified as Lucas category 3-4. Preoperative IJVCI will be measured using ultrasonography before spinal anesthesia during spontaneous and deep respiration. The incidence of hypotension within the first 20 minutes after spinal anesthesia will be recorded. The diagnostic performance of IJVCI in predicting hypotension will be analyzed.

The postpartum period is a critical time marked by significant physiological and psychosocial changes that can affect sleep, emotional well-being, and breastfeeding behaviors. Previous studies indicate that mode of delivery and sleep quality are closely associated with breastfeeding outcomes, with cesarean birth often linked to poorer sleep and lower breastfeeding success. Evidence also suggests that postpartum sleep disturbances are related to reduced breastfeeding self-efficacy, lower motivation, fatigue, depressive symptoms, and shorter breastfeeding duration. However, the literature lacks studies that evaluate insomnia severity, breastfeeding motivation, and breastfeeding success simultaneously-particularly during the first 48 hours after birth. This analytical study aims to assess insomnia severity, breastfeeding motivation, and breastfeeding success (LATCH) within the first 48 postpartum hours and to examine the relationships among these variables. Findings are expected to support early postpartum clinical interventions to improve maternal and infant health outcomes.

The hypothesis of this trial is that the absence of systematic bladder catheterization in patients performing spontaneous urination in the hour preceding the planned cesarean section under spinal anesthesia would not lead to more bladder heterocatheterization for postpartum urinary retention (RUPP) in the 24 hours post-cesarean section than systematic intraoperative bladder catheterization up to 2 hours post-surgery.

Spinal anesthesia for elective cesarean section is frequently associated with hemodynamic instability and postoperative complications such as postoperative nausea and vomiting (PONV) and delayed gastrointestinal recovery. Although intraoperative fluid administration is routinely used to prevent spinal-induced hypotension, the optimal fluid strategy remains unclear. Both restrictive and liberal fluid approaches may influence maternal hemodynamics and postoperative outcomes through different physiological mechanisms. This prospective, single-center, randomized controlled trial aims to compare restrictive (≤3 mL/kg/h) and liberal (\>3 mL/kg/h) intraoperative crystalloid fluid strategies in patients undergoing elective cesarean section under spinal anesthesia. The primary outcome is the incidence of PONV within the first 24 hours postoperatively. Secondary outcomes include postdural puncture headache (PDPH), time to first flatus, hypotension frequency, and vasopressor requirements.

This study plans to learn more about postoperative pain management after cesarean deliveries (C-sections). As a part of standard of care, the Children's Hospital Colorado's Colorado Fetal Care Center (CFCC) follows the standard Enhanced Recovery After Cesarean (ERAC) guidelines to manage pain following C-section delivery. In addition, the CFCC uses an FDA approved medical device called the ON-Q ® Pump, which continuously delivers local anesthetic medication to control pain in the area of your procedure. The local anesthetic used is bupivacaine, which is FDA approved for use to control local pain after C-sections. The CFCC has found a significant reduction in opioid use after adopting both of these procedures. The study aims to determine if the ERAC protocol or ON-Q ® Pump continuous infusion is responsible for lower opioid use by comparing bupivacaine (treatment) versus saline (placebo) groups.

The goal of this randomized controlled clinical trial is to determine if low-dose intrathecal morphine is superior to a Transversus Abdominis Plane (TAP) block with ropivacaine and clonidine for postoperative analgesia in women aged 18 years or older undergoing elective cesarean section under neuraxial anesthesia. The main questions it aims to answer are: * Is intrathecal morphine more effective than TAP block in reducing postoperative somatic pain at rest? * Does intrathecal morphine differ from TAP block in terms of adverse events, pain during mobilization, visceral pain, rescue analgesic use, maternal satisfaction, and newborn wellbeing? Researchers will compare the intrathecal morphine (ITM) group to the TAP block (TB) group to see if ITM provides superior analgesia and improved secondary outcomes. Participants will: * Undergo spinal anesthesia with hyperbaric bupivacaine and sufentanil * add 30 μg intrathecal morphine (only ITM group) * receive bilateral ultrasound-guided TAP block with 20 ml ropivacaine 0.25% and 75 μg clonidine per side (only TB group) * receive standardized postoperative analgesia with paracetamol, ibuprofen, and tramadol as needed * be monitored postoperatively for pain (somatic and visceral, at rest and with movement), adverse events, mobilization, maternal satisfaction, and newborn outcomes at regular intervals for 24 hours This is a single-center, pilot, single-blind trial involving 100 participants (50 per group).

This study aims to compare the efficacy of intravenous dexmedetomidine infusion versus virtual reality (VR) in reducing maternal anxiety, stress, and hemodynamic instability during cesarean section and their effects on neonatal outcome as respiration and heart rate.

The goal of this clinical trial is to compare the onset of sensory block between epidural anesthesia and dural puncture epidural (DPE) in patients undergoing elective cesarean delivery. The study also aims to evaluate hemodynamic stability and procedure-related side effects associated with both techniques. The main questions it aims to answer are: 1. What is the difference in the onset of sensory block between epidural anesthesia and dural puncture epidural (DPE) in patients undergoing cesarean section? 2. Are there differences in hemodynamic stability between epidural anesthesia and DPE during surgery? 3. What procedure-related side effects occur with each anesthetic technique? Researchers will compare epidural anesthesia with dural puncture epidural (DPE) to determine which technique achieves a faster and more effective sensory block while maintaining maternal hemodynamic stability. Participants will: 1. Be randomly assigned to receive either epidural anesthesia or DPE anesthesia 2. Undergo elective cesarean delivery under regional anesthesia 3. Have sensory block onset, hemodynamic parameters, and adverse events monitored and recorded intraoperatively

The aim of this study is to compare Surgical Transversus abdominis plane block and Ultrasound guided transversus abdominis plane block (TAPB) as a postoperative analgesic regimen in female patients undergoing elective cesarean delivery.

Spinal anesthesia-induced hypotension remains a common and significant complication during cesarean sections, posing risks for both mother and fetus. Vitamin D deficiency, frequently observed in pregnant women, is associated with altered vascular function and potential hemodynamic instability. This prospective observational study aims to investigate whether vitamin D deficiency is associated with an increased incidence and severity of spinal anesthesia-induced hypotension in pregnant women undergoing elective cesarean delivery. Vitamin D levels will be measured preoperatively, and intraoperative hemodynamic parameters will be closely monitored. The findings could contribute to improved management strategies for pregnant patients at risk of severe hypotension.

The goal of this clinical trial is to test the ability of different bacterial products in restoring natural gut microbiota in C-section born infants. The main question it aims to answer is: Do maternally derived strains of bacteria perform better than commercially available probiotic strains in restoring the gut microbiota of C-section born infants? Researchers will compare the gut microbiota of treated infants to that of untreated C-section born infants and untreated vaginally born infants to see if the bacterial treatments cause the microbiota to resemble that of vaginally born infants. Participants will be given a bacterial product orally once daily for either one or four weeks and be asked to collect faecal, urine and saliva samples.