Inclusion Criteria:  18 years of age or older Primiparous Intend to breastfeed had a singleton pregnancy had term infant (37-42 weeks gestation) Cantonese speakers Hong Kong residents had no serious medical or obstetrical complications  Exclusion Criteria:  Infant is <37 weeks gestation Infant has an Apgar score <8 at five minutes Infant has a birthweight <2500 grams Infant has any severe medical conditions or congenital malformations Infant is placed in the special care baby unit for more than 48 hours after birth Infant is placed in the neonatal intensive care unit at any time after birth