As with almost anything else in your body (finger size, feet size, eyesight) asymmetry is normal. For some mothers the difference might hardly be noticable and for others there might be a big difference. In terms of breastfeeding, this is not a problem.
Why do babies prefer one breast?
- Sometimes your let-down in the one breast is too slow or too forceful. in turn, they will prefer the breast with a faster/slower let-down and in which the supply is more plentiful.
- All women have one breast with more ducts and alveoli than the other.
- Babies have a side preference. They tend to be more comfortable being held to one side and therefore tend to nurse more efficiently and frequently on one side.
- You as a mom may subconsciously offer one breast more than the other because it feels more comfortable on one side.
- A clogged milk duct or mastitis can give breastmilk a salty taste which would make your baby refuse that breast.
If you want to “even-things-out” here are a few things you could try:
- Start baby on the smaller side for each feeding as they tend to nurse more vigorously on the first breast offered.
- Pump the smaller side for 5-10 minutes after some feedings.
- Add extra pumping session for 10-20min in between feedings.
Will your baby get enough milk if she just feeds on the one breast? YES, your baby will get all that she/he needs as long as she/he is allowed to nurse as often as they want to.