Using a manual breast pump takes a bit of practice, but most people get comfortable with it within a few sessions. The process involves centering the flange over your nipple, squeezing the handle in a rhythm that mimics your baby’s feeding pattern, and switching breasts every five minutes or so for about 15 minutes per side. Below is everything you need to know to get a good output with minimal discomfort.
Getting the Right Flange Fit
Before you pump for the first time, check that your flange (the cone-shaped piece that sits against your breast) is the right size. A poor fit is the single most common reason for low output and sore nipples. Flange sizes are measured in millimeters based on the width of your nipple tip, not your areola. Your left and right sides can be different sizes.
To measure, use a ruler with millimeter markings and place it across the widest part of your nipple tip before pumping. Then try flanges in a few sizes: one slightly smaller than your measurement, one about the same, and one slightly larger. The right fit means only your nipple gets pulled into the tunnel, the sides of your nipple lightly touch the tunnel walls, and the nipple glides gently back and forth during suction. If the flange is too small, the nipple won’t move freely and you’ll get little milk. If it’s too large, it can cause swelling, pain, and also reduce output.
Triggering Your Let-Down Before You Start
Milk won’t flow until your let-down reflex kicks in, and a manual pump doesn’t have a built-in stimulation mode the way most electric pumps do. Spending a minute or two preparing your breasts makes a noticeable difference. Place a warm, damp washcloth over each breast for a few minutes before you begin. You can also do a light self-massage, working from the outer edges of the breast toward the nipple, or gently roll your nipple between your fingers. None of this should hurt. The goal is simply to signal your body that it’s time to release milk.
Step-by-Step Pumping
Once you’re warmed up and your pump is assembled, here’s the sequence:
- Center the flange. Place the breast shield over your nipple so it sits snugly with the nipple right in the middle. A centered seal is what creates suction.
- Start with quick, light squeezes. Squeeze the handle gently and rapidly for the first minute or two. This mimics the short, fast sucking a baby does at the start of a feeding to trigger let-down. Be patient: it can take a few minutes before any milk appears.
- Shift to slower, deeper squeezes. Once milk starts flowing, switch to longer, more rhythmic compressions. Squeeze, hold briefly, then release. This mirrors the deeper, slower sucking pattern of an actively feeding baby. Because you control the handle, you can adjust the speed and suction pressure to whatever feels comfortable.
- Switch breasts after about 5 minutes. Move to the other side and repeat. Alternate back and forth, spending roughly 15 minutes on each breast total. Switching stimulates both breasts and often results in a second let-down on the first side when you return to it.
A full session typically lasts 20 to 30 minutes. You’ll know you’re done when milk flow slows to occasional drops despite continued pumping.
Hand Expression as a Backup
You don’t always need a pump. Hand expression works well for relieving engorgement, collecting small amounts of milk, or situations where you don’t have your pump with you. The technique, sometimes called the Marmet method, uses a simple three-step rhythm: press, compress, relax.
Place your thumb on top of the breast and your fingers underneath, about an inch behind the nipple. Press your fingers back toward your chest wall with firm but gentle pressure. Then roll your fingers forward (don’t slide them across the skin) to push the milk out from behind the areola. Release and repeat. After a few cycles, it becomes rhythmic, similar to a baby’s suckling pattern. Rotate your hand position around the breast to drain different milk ducts.
Hand expression during pregnancy is also an option for collecting colostrum. Starting between 36 and 37 weeks is generally considered safe for uncomplicated pregnancies. A large study published in The Lancet in 2017 found no harm in advising pregnant women with diabetes to begin hand expression at 36 weeks. However, if you have a history of preterm contractions or a cervical cerclage, your provider may recommend against it because nipple stimulation releases oxytocin, which can trigger uterine contractions. Mechanical breast pumps should not be used during pregnancy for the same reason.
Cleaning After Every Use
Disassemble every part that touched your breast or milk: the flange, valve, membrane, and collection bottle. Rinse all pieces under running water right away to remove residual milk, then wash with regular dish soap and warm water. Don’t use antibacterial soap, as the CDC notes that its additives aren’t proven more effective than plain soap for this purpose and may not be safe for daily use on pump parts. Rinse thoroughly to remove all soap residue.
Once a day, sanitize the parts after washing them. You can either boil them in a pot of water for five minutes or use a microwave steam bag designed for pump parts. After sanitizing, let everything air-dry on a clean, unused dish towel or paper towel. Don’t rub or pat pieces dry with a cloth, since that can transfer bacteria back onto the clean surfaces.
Storing Your Milk Safely
Freshly pumped milk stays safe at room temperature (77°F or cooler) for up to 4 hours. In the refrigerator, it lasts up to 4 days. For longer storage, freeze it: 6 months is ideal, though up to 12 months is acceptable. If you thaw frozen milk in the refrigerator overnight, use it within 24 hours. Once milk has been warmed or brought to room temperature, it needs to be used within 2 hours.
Troubleshooting Weak Suction
If your pump suddenly feels like it’s lost suction, the most common culprit is the valve or membrane. These are the small, flexible parts that create the seal allowing suction to build. Check that the valve’s slit is fully closed when not being squeezed. Look for cracks, tiny holes, or tears in both the valve and the membrane. Even a small defect breaks the seal. These parts are inexpensive and meant to be replaced regularly, so keep spares on hand.
If the parts look fine, double-check your assembly. A single piece out of alignment can prevent suction from building. Also revisit your flange fit: nipple tissue can change size over time, especially in the early months postpartum, and a flange that fit well at first may need to be swapped for a different size.
Why Some Parents Prefer Manual Pumps
Manual pumps are quieter, lighter, and cheaper than electric models. They don’t need batteries or an outlet, which makes them easy to toss in a bag. The biggest advantage, though, is control. You set the suction strength and rhythm with each squeeze, which many people find more comfortable than an electric pump’s fixed cycles. That said, they do require more physical effort, and pumping both breasts takes longer since you can only do one at a time. Most people use a manual pump as a supplement for occasional use or on-the-go pumping rather than as their only pump for exclusive pumping.