How Breasts Make Milk How do breasts make milk? Your breasts
contain small sacs called mammary glands. These glands make
breast milk. The milk travels from the mammary glands through
tubes in your breasts called ducts. The milk collects in an area
called the sinus. When your baby breastfeeds, the milk moves
from the sinus out of the breast through tiny holes in the
nipple. What are the stages of making milk? Your breasts go
through four stages when making milk: - Stage 1: This stage
begins in your second trimester (months 4 to 6) of pregnancy.
Hormones (chemicals in your body) are released that tell your
mammary glands to start making milk. In the first 24 to 48 hours
after you give birth, your breasts produce a small amount of
colostrum. This thick substance is the first milk your body
makes for your baby. - Stage 2: This stage begins about 3 to 5
days after you give birth, when your mature milk comes in. Your
breasts will feel fuller as they increase the amount of milk
they produce. It may take 6 to 10 days