Why do I produce breast milk when pregnant
Your breasts are getting ready for feeding your baby!
Producing milk is caused by your pregnancy and the hormone changes in your body. By the middle of the second trimester your breasts are fully capable of making enough breastmilk to feed a newborn baby. Some moms will even experience leaking during the second and third trimesters. It is normal to leak milk. It is also normal if you don't leak milk.
You don't need to do anything to your breasts to prepare for breastfeeding, they do all the preparation on their own.