e. Recruitment, inclusion/exclusion criteria and consent of mothers and their families A previously successful approach to recruitment will be used in which trained field assistants will identify women who are in their third trimester of pregnancy by systematic door-to-door surveys across the "Mahallas" over a 3 month period. Pregnant women will be included who are 16 to 35 years with no more than three living children. Women who plan to migrate from the Mirpur area after delivery will be excluded. Also women with documented medical records of heart disease, tuberculosis, gestational diabetes or eclampsia in previous pregnancies will be excluded. Mother-infants pairs will also be excluded where there are multiple births, congenital abnormalities, very low birthweight below 1.5 kg or infant admitted to a neonatal intensive care unit.