If your baby seems to react badly to infant formula milk, you're probably wondering why it's happening. Maybe you think it's a cows' milk allergy, milk protein intolerance, or lactose intolerance.

When Can Your Baby Drink Milk? It’s best to feed your baby only breast milk until 6 months of age. If you can’t breastfeed, you can give them infant formula. You can start introducing pureed foods at ...