Uneven Milk Supply: Should I Be Concerned?

January 12, 2012

No person is perfectly symmetrical, so it’s no surprise that many breastfeeding moms report uneven milk supply. This is very common, and if you and your baby are comfortable, there’s no reason to try to change it. However, some moms prefer to even things out to relieve discomfort and make feeding more effective for baby. So, let us walk you though some of the causes of uneven milk supply and how to restore balance.


  • Typical Anatomic Differences. It’s very common for mothers to have different sized breasts and milk ducts. This can lead to variations in supply and breast appearance.
  • Forceful or Weak Letdown. It’s also possible that you may have one breast with a more or less forceful letdown than the other. A forceful letdown could be overwhelming to your little one, causing them to pull away from the breast and prefer the other side. Likewise, a less forceful letdown could be frustrating to a hungry belly. To help your little one nurse on the less forceful side, do breast compressions to increase the flow while feeding.
  • Baby’s Preference. Some babies may, quite simply, just prefer one breast over the other. It may be more comfortable to them, or just easier for them to latch. If your baby refuses one breast, ask your doctor to do a thorough physical exam to check for birth injuries or an ear infection. This discomfort could cause your little one to reject certain nursing positions or breasts.
  • Mother’s Preference. Many moms may unknowingly prefer feeding from one breast and spend significantly more time with baby latched on that side. Some moms may prefer holding their little one with their dominant arm or having that arm free to do other things.
  • Breast Injury or Surgery. If you’ve ever had breast surgery or an injury to your breast tissue, your supply and milk flow could be affected. If you think this is the case, consider reaching out to a Lactation Consultant to help you and your baby nurse comfortably from that side.

Restoring Balance

  • Begin feedings on the less productive smaller side. Babies tend to nurse more vigorously at the beginning of a feeding, so start with the less productive smaller side to help increase milk production.
  • Nurse on the smaller side more often during each feeding. Nursing frequently is key to increasing and maintaining supply, so start pumping from your less productive smaller side more often. However, be sure not to neglect the larger breast. Decreasing the time you spend nursing on that side could lead to engorgement, plugged ducts or mastitis.
  • Pump on the less productive smaller side after feedings. At the end of your normal feedings, continue to pump for a few additional minutes, and store that milk for later use.
  • Pump in between feedings. If you can, try to add  a few extra pumping sessions throughout the day, in between your normal feedings. Consider using a hands-free breast pump so you can multi-task while pumping.
  • Use new tactics to encourage feeding on the less preferred breast. There are ways to begin to change your baby’s preferences. Start by trying new nursing positions on the less productive smaller breast, because a new position could bring added comfort to feeding on that side. Also, try offering the less preferred breast when your baby is drowsy. They may be less aware and more willing to feed on that side.

Most moms will begin to notice changes in 3 to 5 days, but remember to be patient. Adjusting any behavior can take some time, so praise your little one when he or she nurses well and keep trying.

Moms, did you notice differences in breast size and supply? Did you make adjustments in your feeding habits to try to even things out? Share your experiences in the comments below.

137 thoughts on “Uneven Milk Supply: Should I Be Concerned?

  1. Hi! My baby suddenly only prefers one breast, and rejects the right. We have ruled out ear infections as I nurse him in the same lying down position as the left. She will latch on for a split secone and then pull away . She will not even nurse on the right breast and gives a disgusted look. I have pumped the right side and the supply may be slower but definitely not drying up. Any ideas why the rejection ?

  2. Hello. My left breast is larger but produces less milk than my right one which is smaller. I can produce 3oz from the smaller breast but only 1oz from the larger breast and I’m not sure why? I switch from both breasts while nursing.

  3. I took my little one to his 4 month appointment and his ped. thinks i might have a in balance in my milk supply where im producing more fore milk then hind milk what should i do to correct this to make sure my little one is gettting the fatty milk he needs

    • I was told by a public health nurse to feed twice from the same breast then switch or don’t time your babies feeds just let them eat all their full from one breast and next feed is the next breast. I did the first trick till my milk supply started to stabilize then switched to the second trick.

    • Pump before you feed them to get the fore milk out of the way. The fore milk is more watery looking then the hind milk. Remember that you can’t empty your supply by pumping & that the most fatty milk is towards the back of the milk duct. I did this with both my kids and it worked for me. I hope it works for you!

    • Hi, I have read up on this problem and the best way I know of from research is to pump a little before the feeding so that there isn’t as much foremilk. Good luck to you! I hope this helps!

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