1. Time Table The study will be performed in the mothers' room (rooming-in). We expect to recruit at least 1-2 infants/day. We expect to recruit easily 200 as about 5000 healthy newborns per year are delivered in Maternity Hospital in Ljubljana. Both males and females will be accrued as they present. The study will be performed in the morning in order to facilitate discharge planning and maximize time for the baby to interact with the family.