How to pump more milk
By The Zomee Team · Updated September 25, 2026 · 4 min read
If your pump output feels low, check your flange size first. After fit, pump about as often as your baby eats, keep suction comfortable, and give your let-down a calm start.
Output changes from session to session and from day to day. One slow session tells you little about your supply. Give any change a week or two before you judge it, and if you are worried, talk to a lactation consultant (IBCLC) early.
Is my flange size the problem?
Often, yes. WIC Breastfeeding Support, a USDA program, says the wrong flange size can cause pain and lower your milk supply.
How pumping feels tells you whether to change sizes:
- Just right: The tip of your nipple feels comfortable and moves freely in the breast shield's tunnel.
- Too small: Pumping rubs or pinches, your nipple turns white, red, or purple afterward, or your breasts still feel full when you stop. Try the next size up.
- Too big: A lot of areola pulls into the tunnel, you get more drip than spray, or sessions keep getting longer. Try the next size down, or add an insert, which sits inside the breast shield and makes its tunnel smaller.
How do I find the right size?
Measure the widest part of the tip of each nipple in millimeters, not the base. Match each side to the closest size. If you land exactly between two sizes, start with the smaller one.
Our flange sizing guide has a printable ruler and a size chart for each Zomee pump. Measure again if pumping starts to feel different, because your size can change over months of pumping.
If none of the sizes included with your pump fits, our Perfect Fit Promise™ sends you a pair in the size you need, free. The Mom Line™ can help you measure.
How often and how long should I pump?
About as often as your baby eats. When you're away from your baby or pump exclusively, the CDC suggests pumping as often as your baby drinks breast milk. According to the Mayo Clinic, most newborns feed 8 to 12 times every 24 hours.
For each session, WIC Breastfeeding Support says to expect around 15 to 20 minutes per breast, or longer. If you double pump, both breasts get that time at once. Your breasts may feel softer when you're done.
"Frequency beats duration," says lactation consultant Kristen Hunter, IBCLC. If pumping enough is hard while you're away, the CDC suggests adding an extra session. Our pumping at work guide covers sessions during the workday.
Does more suction mean more milk?
Not usually. "More suction doesn't equal more milk," says Kristen Hunter, IBCLC. Suction should feel comfortable, and you should never feel pain while pumping. Turning it up past comfort can leave you sore.
Turn suction up slowly, and only to a level that feels comfortable. If you need high suction to get any milk flowing, check your flange size again.
Switch modes during a session instead of staying in one. Stimulation Mode uses fast, gentle suction to help trigger let-down, and Expression Mode is slower and deeper. All four Zomee pumps have 2-Phase Mode, which switches on its own from quick stimulation to deeper expression, following a nursing baby's rhythm.
How can I help my let-down?
A calm start and a little warmth can help. La Leche League International notes that let-down depends on oxytocin, a hormone, and that stress affects its release.
Warmth can help relax breast tissue and support oxytocin. Try gentle warmth before you pump, but skip it if a breast is swollen or painful.
Tools like our Zomee Warming & Cooling Lactation Massager can make this step easier. Use its warming setting before a session, then switch to cooling afterward if you're sore.
A few more things can help your let-down:
- Hands-on pumping: Massage your breasts gently before and during a session. Never press hard enough to hurt.
- Your baby: Look at photos or videos of your baby while you pump.
- Covered bottles: La Leche League suggests covering the bottles with a nursing cover or baby socks so you aren't watching the volume.
What if my output drops suddenly?
Check your pump parts first. If a pump that worked well suddenly loses suction, worn parts are the likely cause, especially duckbill valves.
Duckbill valves stretch and diaphragms can tear with use, and either one can weaken suction. Replace both every 1 to 3 months, depending on how often you pump and how you clean them. On the Mother's Nature™ W1, replace the diaphragms every 2 to 3 months.
Where to get help
Call The Mom Line at 1-888-662-7159 for pump, sizing, parts, and support questions. Real moms and certified lactation consultants answer it.
For feeding or supply concerns, talk to a lactation consultant (IBCLC). For pain, fever, a hard or swollen area in your breast, or questions about your baby's weight or diapers, call your provider.
Questions moms ask
What is power pumping?
"Power pumping mimics cluster feeding by alternating pumping and rest over about an hour," says lactation consultant Kristen Hunter, IBCLC. She adds that it "shouldn't replace your regular removal schedule throughout the day." It also won't fix the wrong flange size.
Why do I pump less than my baby eats?
WIC Breastfeeding Support, a USDA program, says a baby is better at removing milk than a pump, so your pump output isn't a full measure of your supply. Output also depends on the time of day and how long it's been since you last nursed or pumped.
Is it normal to pump more from one side?
Yes. Many moms find one side makes more milk than the other. If one side is also uncomfortable, it may need a different flange size.
How do I know my baby is getting enough milk?
Watch your baby's diapers and weight, not your pump output. The American Academy of Pediatrics says that by 5 to 7 days old, a breastfed baby should have 6 or more wet diapers a day. Steady weight gain at checkups is another sign.
