Weight Patterns in the Month After Birth

Inclusion Criteria: * Birth weight ≥ 2000g. * Mother ≥18 years of age and intends to breastfeed for at least 6 months. * Mother anticipates availability for all study visits. Exclusion Criteria: * Birth weight \<2000g * Respiratory distress including tachypnea, head nodding, nasal flaring, chest retractions or grunting * Known major congenital anomalies including orofacial clefts, neural tube defects and congenital heart defects * Contraindication to breastfeeding at each site as determined by a site's national or sub-national health authorities * Twins and other multiples. * Newborns whose birth weight was not obtained in the first six hours. * Newborns whose mothers intend to move or otherwise become unavailable during the follow up period of 30 days after birth