Premature; Infant, Light-for-dates

The objective of this clinical study is to understand the current status of parent-child bond, parenting role perception and well-being of fathers of preterm infants, and to explore the effect of audio-visual interventions on parent-child bonding, parenting role perception and well-being of fathers of preterm infants. The main questions it aims to answer are: * After intervention, whether the parent-child connection between fathers and preterm infants in the audio-visual group is higher than that in the audio-visual group and the control group * After the intervention, whether the father's perception of parenting role in the audio-visual group is higher than that of the vocal group and the control group * After intervention, whether the father's happiness in the audio-visual group is higher than that in the audio-visual group and the control group The investigators will compare the pre- and post-test methods bwtween the experimental groups and the control group. The fathers of enrolled preterm infants will fill in the structured questionnaires at the time before the intervention (Baseline data) and one month later after the intervention.