Vol.1 - Why Am I Pumping So Little? 
If you’re seeing low milk output when pumping, it’s normal to wonder if it’s just a one-time thing or if your milk supply is truly low.
Seeing low output when pumping doesn’t always mean you have low milk supply. Pump output is influenced by many factors. It’s possible to have a normal supply, even if you see a low output when pumping.
Common Causes For Changes In Milk Supply
There are many things that can influence milk supply from session to session. Your milk output can depend on things like how long it’s been since you last removed milk, if you are nursing in addition to pumping, how long you pump, etc. We can even see changes based on the time of day. Fluctuations in milk output are expected.
Don’t judge your milk supply by one pump session. Other recent changes that can affect how much you pump include things like using a new pump or hormonal changes.
Amount of minutes spent pumping: people respond differently to pumps and some might need to pump for longer than others. For example, someone might get a large volume in 10 minutes, whereas someone else might get that same volume in 20 minutes.
Nursing in addition to pumping: you may see a low pump output if you are nursing your baby in addition to pumping. For example, you’ll likely see a lower pump output directly after nursing compared to pumping in place of a nursing session.
Settings: most people respond best to using different modes while pumping. Experimenting with new settings can influence your milk output.
Time of day: your body goes through many hormonal changes throughout the day, including the hormones that influence your milk supply. For example, many people will see higher milk output in the morning hours and lower milk output in the evening hours.
Condition of pump: using a high quality pump is important. A poor quality, old, or damaged pump can change milk output. Pump parts should be replaced regularly.
Insert Sizing: While the flange serves as a base, the insert inside is what actually fits your nipple to create a proper seal. Using the wrong insert size causes pain and lowers your milk output. Since nipple size can change over time, it’s best to remeasure and adjust your inserts regularly.
Asymmetry: it’s common for one breast to produce more than the other.
Is It A Normal Variation Or Something To Look Into?
Signs it’s likely a normal variation:
● Low milk output when pumping was only a one or two time occurrence.
● Your total daily milk supply is the same or gradually increasing.
● Breasts feel notably softer after pumping.
● Baby is showing signs of getting enough (diapers, weight, satisfaction levels).
If you’re not seeing these signs, it’s likely time to take a closer look and make some adjustments.
When To Contact A Provider
Signs you should contact a provider:
● Persistent low output across multiple pump sessions.
● Total daily output is gradually decreasing.
● Baby is showing signs they aren’t getting enough.
● Breast or nipple pain.
● Clogged ducts or mastitis.
A Note For Moms
Fluctuations in milk output are not always a cause for concern. Output can be influenced by many things. The most important thing is to focus on total output each day.
If you’ve ruled out normal fluctuations and want to increase supply, review the next article: “How to Increase Pump Output: Evidence-Based Methods.”
Warm Reminder
This article is for general information only and is not medical advice. If symptoms persist, feel unusual, or you’re unsure what to do, please consult a doctor or a qualified lactation professional.
This guide was reviewed by lactation expert:
Kaylee Rabaja, BSN, RN, IBCLC
Kaylee Rabaja is an internationally board certified lactation consultant (IBCLC) and the founder of www.lactationconsultant.com, a virtual lactation practice supporting families around the world. She specializes in helping families navigate milk supply, pumping, and infant feeding. Her approach focuses on evidence-based guidance.