By Demi Lucas
IBCLC, PMH-C, Doula
Worrying about milk supply is one of the most common concerns I hear as an IBCLC,
and if you’re reading this while wondering whether your body is making enough milk for your baby, I want to start by saying this: you are not alone, and your concerns are valid.
Understanding milk supply can feel mysterious, emotional, and deeply personal. The good news is that in many cases, supply challenges are temporary and very responsive to small, thoughtful adjustments with the right support and guidance. Understanding what’s happening in your body can take some of the fear out of the equation and help you move forward with confidence.
Broadly speaking, when we talk about insufficient milk supply, we’re usually describing one of two patterns: primary low milk supply or secondary low milk supply. Knowing the difference between these two can help you better understand what might be going on, and more importantly, help you know what kind of support would be most helpful.
Primary low milk supply is when the body has a limited ability to produce a full milk supply from the beginning due to an underlying health reason that prevents it from producing milk efficiently. This is far less common than most parents think. It can be related to certain hormonal or thyroid conditions, previous breast surgery that affected milk-making structures such as nerve pathways involved in lactation, or other identifiable underlying medical considerations. Often there may be subtle clues in a person’s health history, such as minimal breast changes during puberty or pregnancy, difficulty producing milk with previous babies despite frequent feeding or pumping, or a known hormonal imbalance. With primary low milk supply, even when feeding and pumping are well managed, milk production may not increase to a full supply. That can be hard to hear, and it can bring up grief. But it’s important to remember that feeding your baby is not all-or-nothing. Many parents with primary low supply are able to combine feed in a way that protects breastfeeding while ensuring the baby is fully nourished, and that is a beautiful, loving
outcome.
Secondary low milk supply, on the other hand, is much more common and often much more
responsive to change. Secondary low supply happens when milk production starts normally but decreases over time due to something interfering with the supply-and-demand process. Milk production works on a feedback system: the more milk that is removed, the more milk your body is signaled to make. If milk isn’t being removed effectively or frequently enough, supply can dip.
Common reasons include shallow latch or ineffective milk transfer, scheduled or spaced-out feedings in the early weeks, early supplementation without pumping to replace those missed feeds, exclusive pumping with a flange that doesn’t fit well, using a pump that isn’t efficient for your needs, pumping sessions that are too short, returning to work without enough pumping breaks, stress, illness, certain medications, or a sudden drop in nighttime feeds.
The encouraging part about secondary low supply is that when we identify the “why,” we can usually create a clear plan to support rebuilding supply.
So how do you begin to discern between the two? While only a personalized assessment can provide clarity, there are some general patterns to notice. If milk supply has felt low from the very beginning, despite frequent feeds and strong breastfeeding management, and if there are medical or hormonal factors in your history, primary low supply might be a possibility worth discussing with a lactation consultant. If supply was robust in the early weeks and then dipped after a change in routine, latch, pumping schedule, or life circumstances, that points more toward secondary low milk supply. If your baby was gaining well and then weight gain slowed, or if you notice your pump output decreasing after returning to work, that’s often secondary.
It’s also important to gently reality-check what “low supply” actually means. Many parents
assume they have low supply because their breasts feel softer, their baby feeds frequently, or they aren’t pumping large volumes. But softer breasts are normal as your body regulates.
Cluster feeding can be normal and helps build supply. Pump output is not a perfect measure of what your baby can remove at the breast. Babies are usually much more efficient than pumps. True signs that milk supply may need support include consistently low diaper output, slow or stalled weight gain, or ongoing signs of hunger after most feeds. When in doubt, weight checks and feeding assessments are much more reliable than how full your breasts feel.
If you are pumping, especially with wearable pumps or returning to work, your equipment
matters more than most people realize. Proper flange sizing, suction levels that are effective but comfortable, and pumping long enough to reach multiple letdowns can make a meaningful difference. Hands-on pumping, breast compressions, and making sure milk is being fully drained all support your body’s signal to make more. Little tweaks can yield big changes over time.
Emotionally, fear of low supply can spiral quickly. Social media, freezer stash culture, and
well-meaning comments from others can amplify anxiety. I want to gently remind you that your worth as a parent is not measured in ounces. Some babies thrive on direct feeding with little pumped milk stored. Some families use combination feeding from the start. Some rebuild supply after a dip. There are many successful feeding stories, and they don’t all look the same.
If you’re feeling unsure, this is exactly where an IBCLC can be invaluable. An International
Board Certified Lactation Consultant can assess latch and milk transfer, review your pumping routine and flange fit, talk through your birth and health history, and help you distinguish between primary and secondary low milk supply patterns. Most importantly, they can help you create a plan that fits your goals and your life. Sometimes that plan focuses on increasing stimulation and milk removal. Sometimes it includes temporary supplementation while protecting supply. Sometimes it’s about adjusting expectations and finding peace in a combination feeding rhythm.
The key is that you don’t have to figure it out alone. Early support tends to be the most effective support. If something feels off, trust that instinct and reach out. Even one visit can provide clarity and reassurance. Many parents who fear they have low milk supply discover that with a few small adjustments, their supply responds beautifully. And for those who truly do have a primary supply challenge, having compassionate guidance can make the journey feel supported rather than isolating.
However your feeding story unfolds, you deserve encouragement, good information, and tools that work for you. Your body is not failing you. Your baby does not need perfection. They need nourishment, love, and connection. You are already providing that.
Disclaimer:
This article is intended for general educational purposes only and is not meant to provide medical or clinical advice or replace individualized care. Every parent and feeding journey is different. If you are experiencing ongoing pain, concerns about milk production, or persistent pumping challenges, please seek personalized support from an International Board Certified Lactation Consultant or other qualified healthcare professional who can provide guidance specific to your situation.