It doesn't matter if your bra size is a 40D or a 36DDD. If you've never had any breast surgeries or major traumas to the breast, you should be able to breastfeed. Yes, once your milk comes in, they will get a bit larger. But believe it or not, that should not have a major impact on your ability to breastfeed. The issue with large-breasted women is that it may take a little more work than usual to find that perfect position in which to latch on the baby. A football hold is typically the best position, but you may find a different one that suits the two of you. A lactation consultant can help you along with this.
Breasts Too Small?
You may think you're the flattest woman around and can't imagine how in the world you're going to breastfeed, but here is the great news: The woman with the enormous breasts only has more fatty tissue than you and that makes them bigger. However, the milk producing mechanism is generally the same in both big and small breasts, so breast size has nothing to do with the ability to produce breast milk and to breastfeed. Believe it or not, your breast size will increase during pregnancy, especially during the third trimester when the alveoli (milk-producing cells) and milk ducts (the tubes that carry the milk to the nipple) grow and branch out significantly.

