How do I know if my baby is really full when I give formula?

Breastfeeding is quite simple: a baby will take everything he needs until he is completely satisfied.

If you supplement milk formula in your baby's diet, watch your baby's behavior. If your baby runs out of a bottle, he may still be hungry. 

Important:

Prepare enough infant formula where there is likely to be an excess, so that your baby takes what he needs until he is satisfied and will stop.