Nothing beats the mother's milk as far as babies are concern especially for the newborn since it contains lots of immune boosters and antibodies to prevent allergies and some for combating infections. But if mother's milk is not available, then it is advisable to consult the pediatrician first to know what suits the baby best. There are cases wherein a baby is allergic or sensitive to some kind of milk, in which case the doctor would recommend a special infant formula. It's best to seek professional assistance.