The best milk for Low Birth-Weight infants is breast milk, although they also need a certain amount of minerals and energy, as they require more calories than normal weight babies. At first an LBW infant may be too weak to suck and may not be able to handle large quantities of milk. You may have to feed the infant frequently with smaller quantities of milk. If the baby is unable to suck for long, express the milk and feed it with a spoon.
Breast milk has many protective properties which prevent infection in these babies. If, for some reason, breast milk is not available, then resort to formula feeding. Your doctor is the best judge of the formula necessary.