Pumping log: what to track and what your numbers mean

By Kaya Thomas, founder of Milk Diary

A pumping log can be reassuring. It can also turn every session into a test. This guide covers what's worth tracking, how much milk is normal to pump, what the numbers can and can't tell you, and what to check when they drop.

It's not medical advice. If you're worried about your supply or your baby's feeding, talk to your lactation consultant or pediatrician.

What to log for each session

Keep it simple. These details are the most useful later:

• Start time. This shows how often you're pumping and how long the gaps are.
• How long you pumped.
• How much you got from each side. A difference between sides is common, and tracking it helps you notice a change.
• Your pump and settings. Note the pump, the flange size, and the suction and speed settings, so you can tell what's working.
• Where the milk went. Track whether it went to a bottle, the fridge, or the freezer.
• Anything that might matter. A missed session, a stressful day, feeling unwell, or the start of your period.

Look at your daily total, not one session

Pumping output changes from session to session and from day to day. One small session doesn't mean anything on its own. Your 24-hour total and how it moves over a week or two tell you much more.

How much milk is normal to pump?

It depends on whether you also nurse:

• Pumping in addition to nursing. If you nurse full time and pump to save extra, about 0.5 to 2 oz total from both sides per session is typical. 4 oz is a lot in this case.
• Pumping instead of a feed. You'll usually get more when you pump while separated from your baby, like at work, because the pump replaces a feed.
• Pumping all of your baby's milk. Your daily total roughly needs to match what your baby drinks. Between 1 and 6 months, babies who only have breast milk drink about 25 oz (750 mL) a day on average, usually somewhere between 19 and 30 oz.

Pump output isn't your milk supply

How much you pump isn't a measure of how much milk your baby gets when they nurse. Pumps don't respond to your body the way a baby does, and lots of people who pump very little have plenty of milk for nursing.

If you're unsure whether your baby is getting enough, your pediatrician and lactation consultant will look at your baby: weight gain, wet and dirty diapers, and how feeds are going. Your pumping numbers are one piece of that picture, not the whole thing.

When your numbers drop

A drop in output is common, and it often has a simple cause. Some things to check:

• Worn pump parts. Valves and membranes wear out. Replace parts that are worn or haven't been changed in the last 3 to 6 months.
• Flange size. A different size makes pumping more comfortable or more productive for some people. A lactation consultant can check your fit.
• Fewer sessions. Dropping a session, longer gaps overnight, or your baby nursing less can all lower your supply.
• Your period or ovulation. These can cause a temporary dip.
• Stress, illness or dehydration.
• Hormonal birth control and some medications. Ask your doctor or pharmacist if you've started something new.

If the dip lasts or you're worried, bring your log to your lactation consultant. A week of real numbers makes the conversation much easier.

Don't let the log run your day

Tracking should help you, not grade you. If checking the numbers is adding stress, try looking only at your daily total, or only once a week. Any amount of milk you give your baby counts, and so does how you feel.

Using Milk Diary as your pumping log

Milk Diary is a feeding tracker built by a mom and a lactation consultant. It covers everything in this guide:

• Log each session with one tap. The pumping timer records when you started and how long you pumped, then you add how much you got from each side.
• Remember what's working. Record which pump and settings you used for each session.
• See your daily totals at a glance. The All entries page shows your full log history with a total for each day, so you don't have to add anything up.
• Spot trends week to week. Daily progress, streaks and weekly insights show where your output is heading, like when you're pumping about 2 oz more a day.
• Set goals that encourage you. Set a daily pumping or storage goal and watch it fill up through the day. Goals are developed with an IBCLC to encourage you, not to grade you.
• Track fridge and freezer milk with automatic expiration dates.
• Share your log. Create a PDF report for your lactation consultant or pediatrician, and let your partner log from their own phone.

Your data stays on your device and in your own iCloud. We can't see it, and there's no account to create.

Sources

• Kelly Bonyata, IBCLC. I'm not pumping enough milk. What can I do? KellyMom.
• Kelly Bonyata, IBCLC. How much expressed milk will my baby need? KellyMom.