02/07/2026
If youβre pumping and struggling with milk supply, your fl**ge size may be incorrect. Hereβs how an IBCLC can help:
π measure your optimal pump fl**ge size
πΌ optimize your pumping technique
π€ answer any questions you have!
Send me a DM if you have any questions π€
For decades, 24 and 27mm fl**ges have been treated as the standard sizes for breast pumps. These sizes were arbitrarily picked and not actually based on any research or science. Old advice used to recommend sizing up for comfort. Once multiple sizes because available, common recommendations included measuring the base of the ni***es and adding 2-3mm. As more moms started pumping and pumps became more widely available for use, we also saw an increase in plugged ducts, mastitis, ni**le damage and dropping milk supply. Why?! We now know that these sizes are far too big for most women. In fact, ACTUAL research on pump fl**ge fit recommends going SMALLER. New guidelines recommend measuring the base AND the tip of the ni**le and starting with the smaller size and gradually increasing until maximal comfort and milk output are observed. The most common sizes I see in my practice are 13-17mm. I rarely have anything above and 18. Yes. Anatomy is unique. Occasionally someone may need larger for their anatomy. But itβs extremely rare to use what comes in the box.
If your lactation consultant at the hospital told you the 24mm was good by just looking at your ni**le, or they measured the base of the ni**le and added to that number, they are working off of old recommendations that were not based on research because it didnβt exist until 2024. But that could absolutely impact your pumping journey. Hospital based IBCLCs are AMAZING!!! They often donβt have as many resources, have too many patients to see, and are doing the best they can. They may not have time to tell you all of these things or even know it is a thing yet. It is a thing and size does matter.