4.3.4 Anthropometry: For infants, size at birth (weight, length, head circumference) and gestational age will be documented from the vaccine carnet. Growth will be assessed each visit using triplicate measurements of weight (to the nearest g without clothing/diaper), crown-heel length (to the nearest 0.1 cm using an infant length board) and head circumference (to the nearest 0.1 cm using a non-stretchable tape). Data will be expressed in absolute units and standard deviation scores using the data from the Centers for Disease Control at each age. Quality of growth achieved after term age will be available as lean and fat mass provided during measurement of bone mass using DXA, reported as accurate and reproducible (49).