my baby hardly eats anything. he is 2+ now, but he does not drink dairy milk, he only needs formula milk, (he's habitual of formula milk, we had to give it during his infancy, as he was premature and one month in hospital, so that time my lactation reduced, and from his 3 months we had to give formula milk) . once dr. said keep him hungry, he will drink, but this trick also failed. what should I do??