Inclusion Criteria:  being ≥18 years being Chinese ethnicity and Hong Kong residents without any serious medical or obstetric complications having a full-term (i.e. gestational age ≥37 weeks) healthy infant with normal birthweight (≥2,500 grams)  Exclusion Criteria:  with linguistic and cognitive barriers impeding completion of face-to-face and telephone interviews or comprehension of the intervention materials physical anomalies that contraindicate breastfeeding