#asktheexperts My baby is three months old. From the beginning, he has been on formula milk because his mother has low breast milk secretion, which is not sufficient for his needs. However, over the past seven days, he has suddenly stopped taking formula milk. We have tried various methods—changing the formula brand and feeding with a spoon, dropper, etc.—but nothing has worked. Whenever we somehow manage to feed him, he vomits. Please advise.