When Your Breast Pump Isn't Meeting Your Desired Output (And Why It Might Not Be the Pump)
Have you ever looked at the milk in your collection cup and thought...
"Surely this pump just isn't working."
It's one of the most common concerns we hear from mums, and it's completely understandable. Seeing less milk than you expected can feel frustrating, worrying and sometimes even emotional, especially when you're working so hard to feed your baby.
But here's something many mums don't realise:
The amount of milk you pump isn't a direct measure of how much milk you're producing, and it certainly doesn't always mean there's something wrong with your breast pump.
Let's break down the many factors that can affect your pumping output.
Your Body Isn't a Machine
Unlike filling a bottle from a tap, expressing milk is a complex biological process.
Milk removal depends on your body releasing oxytocin (the hormone responsible for your let-down), how your milk ducts respond, your comfort level, your hormones and many other factors.
Some days you'll pump more.
Some days you'll pump less.
Both can be completely normal.
Flange Size Matters More Than Most People Think
This is one of the biggest reasons mums struggle with output.
If your flange is too large or too small, it can:
- Reduce milk removal
- Cause discomfort
- Increase nipple swelling
- Make you feel like you need higher suction
- Leave milk behind in the breast
Many mums assume the standard size included with every pump will suit them, but nipples vary enormously.
It's also worth remembering that your nipple size can change throughout your breastfeeding journey, meaning the flange that worked at six weeks postpartum may no longer be your best fit a few months later.
Positioning Makes a Huge Difference
Even the best breast pump can't work efficiently if it's not positioned correctly.
A collection cup that's slightly off-centre can reduce suction around the nipple and make milk removal less effective.
Things that can affect positioning include:
- A bra that's too loose
- A bra that's too tight
- The pump shifting while you move
- The nipple not being centred inside the flange
- Silicone inserts not being fitted correctly
Sometimes a tiny adjustment can make a surprisingly big difference.
Higher Suction Doesn't Always Mean More Milk
This one surprises a lot of mums.
Many people automatically increase the suction when they're not getting the output they hoped for.
Unfortunately, more suction isn't always better.
If the suction is too strong it can:
- Compress milk ducts
- Cause swelling
- Make let-down more difficult
- Increase discomfort
- Actually reduce milk removal
The most effective suction level is usually the highest setting that remains comfortable, not simply the maximum setting.
Your Let-Down Is Influenced by More Than the Pump
Stress, anxiety, lack of sleep and even feeling rushed can all affect your let-down.
If your body isn't releasing oxytocin effectively, your pump may not have much milk available to collect, even though your breasts are producing it.
Some mums find it helps to:
- Look at photos or videos of their baby
- Hold their baby beforehand
- Apply warmth before pumping
- Massage the breast
- Relax for a few minutes before starting
Wearable Pumps Have a Learning Curve
Wearable breast pumps are designed differently to traditional wall pumps.
They're made to give you freedom to move, work, cuddle your baby or simply get on with your day.
Because of this, they can sometimes require:
- Different positioning
- Different bra support
- Different suction settings
- A short adjustment period while your body adapts
Many mums notice their output improves after several sessions once they've found the settings and positioning that suit them.
Your Body Responds Differently to Different Pumps
Every breast pump has its own:
- Suction pattern
- Rhythm
- Cycle speed
- Flange shape
- Silicone flexibility
Just like every mum is different, every pump feels different.
Your body may respond better to one suction pattern than another.
That doesn't necessarily mean one pump is faulty. It simply means your body prefers a different style of stimulation.
Pumping Output Changes Throughout the Day
It's completely normal for pumping output to vary.
Many mums notice they express:
- More milk first thing in the morning
- Less milk during the evening
- Different amounts from each breast
This is due to natural hormonal changes throughout the day and isn't usually a cause for concern.
Your Silicone Parts May Need Replacing
Over time, silicone components naturally wear out.
Even if they still look fine, regular use gradually reduces their ability to maintain an effective seal.
Worn parts can contribute to reduced suction and lower milk removal.
Replacement schedules will vary depending on how often you're pumping, but regularly replacing wearable parts helps your pump continue performing at its best.
Your Milk Supply May Have Changed
Sometimes the pump is doing exactly what it's supposed to do.
Your milk supply itself may have changed because of factors such as:
- Baby sleeping longer overnight
- Returning to work
- Hormonal changes
- Illness
- Menstruation returning
- Pregnancy
- Changes to feeding frequency
- Dehydration
- Reduced calorie intake
These changes can all influence how much milk you're able to express.
Pumping Output Isn't a Measure of Your Worth
Perhaps the most important thing to remember is this:
The amount you pump is not a measure of how good a mum you are.
Some mums naturally respond extremely well to a breast pump.
Others don't.
Some exclusively pumping mums produce hundreds of millilitres each session.
Others produce much smaller amounts while still successfully breastfeeding their baby.
Every breastfeeding journey looks different.
When Could It Be a Pump Issue?
Signs that may indicate a pump issue include:
- No suction at all
- The motor won't turn on
- Unusual grinding or mechanical noises
- The pump repeatedly shutting down despite correct charging
- Visible physical damage
- A confirmed fault after troubleshooting
Before Assuming the Pump Is Faulty
If your output has suddenly decreased, it's worth checking:
- Has your flange size changed?
- Are your silicone parts due for replacement?
- Is your bra holding the cups securely?
- Is your nipple centred correctly?
- Are all parts assembled properly?
- Have you recently returned your period or experienced hormonal changes?
- Are you comfortable on your current suction level?
- Are you hydrated and eating enough?
- Are you feeling particularly stressed or exhausted?
Sometimes one small adjustment is all that's needed.
The Bottom Line
When pumping output isn't meeting your expectations, it's natural to question the breast pump first. However, in many cases, the pump is only one small part of a much bigger picture.
Flange fit, positioning, worn parts, suction settings, hormones, stress, hydration, milk supply and your body's individual response all play an important role in how much milk you're able to express.
Finding the right combination often takes a little trial and error, and that's completely normal.
At The Night Owl, we know that every mum's journey is different. If you're experiencing lower than expected output, take a step back, work through the common factors above, and remember that pumping is a skill your body often learns over time.
Most importantly, be kind to yourself. Your worth as a mum is never measured in millilitres.