Effects of Early Behavioral and Transaction Interventions on Preterm Infants' and Parents' Biopsychosocial Well-being

This randomized controlled trial will use a longitudinal repeated-measures design to examine the effects of two interventions, behavioral support interventions and a parent-infant transactional program, on parents' stress, PPD and sleep quality, parent-infant interactions, and their preterm infants' stress (saliva cortisol levels), sleep patterns, emotional regulation, and neurobehavioral developmental outcomes from 7 days to 2 years corrected age.