Premature babies who receive regular massages are more active than premature babies who do not  Even when all the babies drink the same amount of milk, the massaged babies gain more weight than do the unmassaged babies
This is puzzling because a more active person generally requires a greater food intake to maintain or gain weight
Increased activity causes the intestines of premature babies to mature more quickly, enabling the babies to digest and absorb more of the nutrients in the milk they drink.