Your pregnancy can affect your breast milk supply
We’ve already mentioned that the kind of milk you produce will change, but this isn’t the only way your pregnancy will affect your breast milk production.
It’s normal for your breast milk supply to decrease during pregnancy. This is caused by changes in your hormones. How your breast milk supply decreases may vary: it can happen gradually or suddenly.
This decrease in breast milk supply, combined with the different taste, may result in your older child weaning naturally before your newborn arrives. However, even if your older child does continue nursing, you will need to compensate for your lower breast milk supply by adding more food and drinks to your child’s diet.
This change isn’t permanent. After your newborn arrives, your milk supply will once again increase.