Does Mixing Breastmilk and Formula Cause Constipation?

Digestion. Because formula milk is not as digestible as breast milk, your baby may experience more digestive discomfort and wind. They may also get constipated.

Can breast milk and formula cause constipation?

Well, breast milk is generally easier for babies to digest and considered a natural laxative. Formula, on the other hand, is thicker. It has larger proteins that can be harder to digest. This makes gastrointestinal problems — including constipation — more likely.

Is it OK to mix breast milk with formula?

While there's nothing wrong with mixing breast milk and formula in the same container, it's not recommended simply because you don't want to waste a single drop of your precious breast milk. Formula from a bottle that your baby has drunk from must be discarded within an hour of preparation.