Combined home visiting and group intervention
Behavioralhome visit includes pre-discharge meeting with parents; education of appropriate feeding, breastfeeding, sleeping, position of baby, defecation, environment for baby care and resuscitation on emergency situation first visit (5 days after discharge); understanding baby's sign check feeding, sleeping, sanitation, defecation, environment second visit (14 days after discharge); understanding baby's sign and baby's development support parents check feeding, sleeping, sanitation, defecation, environment special situation third visit (4 weeks after discharge) understanding baby's sign and baby's development support parents special situation fourth visit (8 weeks after discharge) same as third visit Group intervention for parental support with baby 12 times during corrected age 3~6 months