Groups B or D mothers will breastfeed according to routine hospital protocol. Standard postnatal nursing care will be followed. 7 days of breast milk samples (of 1ml in the morning and one ml in the evening )will be collected at the end of the 8th day. The details of the delivery, birth weight, and neonatal condition will be collected prospectively at birth. Mothers will be given a neonatal feeding diary to record the frequency and amount of breast milk expressed, the frequency and duration of direct breast feeds, and any other fluids fed to their babies in the first week. They will be asked to record their own perception of when their breast milk flow was established. The babies will be weighed on Day 7.