It’s normal for one breast to be slightly bigger than the other, but when one breast is three sizes smaller than the other, you’ll find that supply is very uneven and there is a notable difference in storage capacity. This difference in size may only become apparent as your glandular tissue builds up to full-production mode in late pregnancy. You may be worried about how much milk you’ll be able to produce if one breast is very small. The upside is that if you have one small and one medium to large breast, this is easier than breastfeeding with two small breasts, so don’t be put off.
To help even up the supply, feed from both sides at each feed. Start feeding with your smaller breast in the morning when your supply is highest, and with your bigger side at later feeds. Any breast that makes milk can produce more milk, so persevere on your smaller side and the supply will increase.
Uneven production levels can make it tricky to get into a breastfeeding pattern, so at first just focus on establishing your milk supply by ensuring your smaller breast is never full for too long, or your supply will drop.