Exclusion criteria: «Dyads were excluded for atypical stays characterized by (1) a 2 - night or longer stay after a vaginal delivery; (2) a 4 - night stay or longer after a cesarean section; (3) a hospital course with atypical complications (e.g., ambiguous genitalia, endometritis); or (4) newborn hyperbilirubinaemia requiring
phototherapy during the nursery stay.