How Many Calories Do You Need While Breastfeeding? (CDC vs ACOG, Explained)

Most breastfeeding moms need about 330 to 400 extra calories a day on top of what they ate before pregnancy, according to the CDC. ACOG says 450 to 500, and the National Academies' 2023 report lands at a net +400 in the first six months. Your exact number depends on your body, activity, and how much milk you make.

How many extra calories does breastfeeding burn?

Making milk takes real energy. Your body is literally making food, around the clock, so it is fair that it asks for more of it.

The most detailed numbers come from the National Academies of Sciences, Engineering, and Medicine (NASEM), whose 2023 Dietary Reference Intakes for Energy is what US nutrition guidance is built on. For women exclusively breastfeeding in the first six months, NASEM estimates:

• Energy cost of milk production: 540 calories a day
• Energy mobilized from body stores: 140 calories a day
• Net extra from food: 540 minus 140 = 400 calories a day

That 140 is the part your body covers itself, drawing on stores it built up during pregnancy. So yes, breastfeeding "burns" around 540 calories a day of milk-making, but the recommendation for what to eat extra is lower, because your body chips in.

From 7 to 12 months, when most babies are partially breastfed alongside solids, NASEM estimates the milk-making cost at 380 calories a day, with no body-store offset applied.

CDC vs ACOG vs NASEM: what each one says

Here are the numbers side by side. Australian readers: food labels use kilojoules, and 1 calorie (kcal) = 4.184 kJ.

Source	Extra per day	In kJ	Notes
CDC	330 to 400 kcal	1,381 to 1,674 kJ	For well-nourished moms, compared with pre-pregnancy intake
ACOG	450 to 500 kcal	1,883 to 2,092 kJ	About 2,500 total if your weight is in the normal range
NASEM 2023, months 0 to 6	400 kcal net (540 cost minus 140 from stores)	1,674 kJ	Exclusive breastfeeding
NASEM 2023, months 7 to 12	380 kcal	1,590 kJ	Partial breastfeeding
Health Canada	No number	n/a	"You need just a little more food each day"

Why do the CDC and ACOG numbers differ?

They are answering slightly different questions.

The CDC's 330 to 400 is framed as the extra you eat compared with before pregnancy, for well-nourished moms. It already assumes your body covers part of the cost from stores. The CDC also notes that needs vary with age, BMI, activity level, and feeding method.

ACOG's 450 to 500 is closer to the full energy cost of making milk, without subtracting what your body supplies on its own. Then it adds a ballpark total of about 2,500 a day for women in the normal weight range. That total is a rough average, not a target for everyone.

NASEM shows the working: 540 to make milk, 140 from stores, 400 net. Put those side by side and the "disagreement" mostly disappears. Everyone agrees the extra lands somewhere around 330 to 500 calories, and that breastfeeding is not the time to run on empty.

Health Canada skips the number entirely and says you need "just a little more food each day," plus plenty of water. Honestly, that is not bad advice for a sleep-deprived brain.

We tried to fetch Australia's NHMRC energy guidance for this post but could not load it, so we have left Australian-specific numbers out rather than guess. Ask your GP, midwife, or child and family health nurse for local advice.

How do I calculate my own calorie needs while breastfeeding?

Two steps:

1. Find your baseline. Use the daily calorie needs calculator with your current weight, height, age, and a realistic activity level (newborn life counts as "lightly active" for most people, pacing included).
2. Add the breastfeeding extra. Use roughly +330 to +500 depending on which guidance you and your clinician go with.

A worked example

Say the calculator gives you 2,000 calories a day as your baseline.

Guidance	Baseline	Extra	Daily total
CDC, low end	2,000	+330	2,330
NASEM, months 0 to 6	2,000	+400	2,400
NASEM, months 7 to 12	2,000	+380	2,380
ACOG, high end	2,000	+500	2,500

Whatever the tool says, treat it as a starting estimate, not a rule. Feeding twins, pumping a lot, or training hard can push needs higher. Feeding less often as solids take over can bring them down. Your hunger is real data here. If you are ravenous, that is not a willpower problem; it is your body doing its job.

Can I lose weight while breastfeeding?

Many people do, gradually, and that is fine. But timing matters, and the first weeks are not about weight at all.

The first six weeks are for recovery and supply. Your body is healing from birth, and milk supply is still settling in. This is not the time for a calorie deficit target. Eat to hunger, keep snacks within reach, and let the scale wait. We are not going to give you a deficit number for this window, because there should not be one.

After that, slow and only with your clinician's OK. Health Canada's guidance for health professionals says that after pregnancy, "gradual weight loss through breastfeeding and keeping up a healthy and active lifestyle should be emphasized." Gradual is the key word. Talk to your doctor, midwife, or a lactation consultant before setting any loss goal, and before dropping below the totals in the table above.

A few things we will not tell you to do: skip meals, crash diet, cut out whole food groups without medical advice, or "work off" a snack. If you have a history of disordered eating, the postpartum months can bring a lot of it back up, so please loop in a professional before tracking calories at all.

And no tracking app, including ours, can promise anything about your milk supply. Supply questions go to an IBCLC.

For a realistic look at the months ahead, see our postpartum weight loss timeline.

Talk to your doctor or lactation consultant (IBCLC). Every number in this post is a population average. Your OB, midwife, family doctor, registered dietitian, or an International Board Certified Lactation Consultant (IBCLC) can tailor them to you, especially if you are feeding more than one baby, exclusively pumping, recovering from a C-section, managing a health condition, or noticing any change in supply or in your baby's weight gain. This post is general information, not medical advice.

How much water should I drink while breastfeeding?

There is no single magic number in the guidance we checked. ACOG says to drink plenty of fluids, and drink more if your urine is dark yellow. Health Canada says it is important to drink plenty of water.

The practical version: keep a big water bottle wherever you usually feed. Many moms notice a wave of thirst right as the baby latches. Drink when it hits.

How much caffeine is OK while breastfeeding?

The CDC says a low to moderate amount, about 300 milligrams or less per day, roughly 2 to 3 cups of coffee, is generally fine. It flags very high intakes, around 10 cups or more a day, as possibly linked to a fussy, jittery baby. ACOG is a bit more cautious at a moderate 200 milligrams a day and points out that caffeine varies a lot between coffee brands.

So your coffee is not cancelled. If you want numbers for your usual order, our calories in coffee guide and Starbucks drink calories cover the add-ins that quietly stack up.

What should I eat while breastfeeding?

You do not need a special diet. The CDC notes that some nutrients, like iodine and choline, can be hard to get from food alone, and that your healthcare provider can help decide whether a supplement makes sense. ACOG says your ob-gyn may suggest continuing your prenatal vitamin.

Beyond that, easy one-handed food wins:

• Protein you can grab: yogurt, cheese sticks, boiled eggs, leftover chicken. See high protein snacks.
• Fiber that keeps you full: oats, fruit, beans. See high fiber foods.
• Something you can eat cold, because your food will go cold.

Common mistakes (and kinder fixes)

• Accidentally under-eating. Newborn days blur, and lunch becomes "half a granola bar at 3pm." Fix: put snacks at every feeding spot and track for a week just to see your real average.
• Cutting too early. Starting a deficit in the first six weeks. Fix: wait, then ask your clinician.
• Copying someone else's number. 2,500 is an average, not a prescription. Fix: run your own estimate with the daily calorie needs calculator.
• Comparing your timeline to anyone's. Every body, birth, and baby is different. Fix: compare your weekly averages only to your own.

Tracking while holding a baby

When I built Nouri, the whole point was that tracking had to be fast enough to actually happen. I used MyFitnessPal first, and the numbers were never the problem. Tracking a normal dinner took several minutes, and after a long day I just would not do it. Now picture that with a baby on your chest at 2am. Not happening.

So in Nouri, you can say it instead. From the lock screen: "Hey Siri, track food in Nouri," then "a bowl of oatmeal with peanut butter and a banana." No unlocking, no scrolling a database, no free hand needed. You can also type it in one sentence or snap a photo, which Nouri turns into a sentence first so you can check what it thinks it saw.

Then the useful part for this stage of life: after three days, your first Nouri Report shows your average calories against your target, and new Reports land on Sundays once you have tracked four or more days that week. Most calorie apps give you numbers. Nouri gives you answers. If your average keeps landing well under what you and your clinician agreed on, that is a gentle nudge to add a snack, not a gold star. More on this in how to track calories while holding a baby and how to log food with Siri.

FAQ

How many calories do I need while breastfeeding?

Most guidance says about 330 to 500 calories a day more than before pregnancy. The CDC says 330 to 400 for well-nourished moms, and ACOG says 450 to 500, or about 2,500 total for women in the normal weight range. Your own number depends on your size, activity, and how much milk you make.

How many extra calories does breastfeeding burn?

The National Academies estimate milk production costs about 540 calories a day when exclusively breastfeeding in the first six months. About 140 of that comes from body stores, so the extra you need from food is around 400. From 7 to 12 months, the estimate is about 380 a day.

Is 1,800 calories enough while breastfeeding?

It depends on your body and activity, so there is no one answer. For many moms, the guidance above would put needs higher than that. Run your estimate with a calculator, then check it with your doctor, midwife, or a registered dietitian before eating less.

Is there a breastfeeding calorie calculator?

Use a standard daily calorie needs calculator for your baseline, then add roughly 330 to 500 calories. Our daily calorie needs calculator handles step one.

Why does the CDC say 330 to 400 but ACOG says 450 to 500?

The CDC figure compares with your pre-pregnancy intake and accounts for energy your body supplies from stores. ACOG's figure is closer to the full cost of making milk. The National Academies show both pieces: 540 to make milk, 140 from stores, 400 net.

When can I start losing weight while breastfeeding?

Not in the first six weeks, which are for recovery and building supply. After that, gradual loss is common, and Health Canada's guidance emphasizes gradual weight loss after pregnancy. Get your clinician's OK before setting any deficit.

Will a calorie deficit affect my milk supply?

We cannot promise anything either way, and neither can any app. If you notice changes in supply or your baby's weight gain, talk to your doctor or an IBCLC right away.

How much caffeine can I have while breastfeeding?

The CDC says about 300 milligrams or less a day, roughly 2 to 3 cups of coffee, is low to moderate. ACOG suggests a moderate 200 milligrams a day. Check your usual drink, since caffeine varies a lot by brand.

How much water should I drink while breastfeeding?

The guidance we checked gives no fixed amount. ACOG says drink plenty of fluids and more if your urine is dark yellow, and Health Canada says to drink plenty of water. Keep a bottle where you feed.

Do I need more calories if I exclusively pump?

Pumping still means making milk, so the same ballpark generally applies. Output varies a lot from person to person, so ask your clinician or IBCLC to help tailor it.

How many kilojoules extra do I need while breastfeeding?

Converting the CDC range gives about 1,381 to 1,674 kJ extra a day, and ACOG's range is about 1,883 to 2,092 kJ. For Australian guidance, ask your GP or midwife.

What is the easiest way to track calories while breastfeeding?

Say it instead of typing it. With Nouri, you say "Hey Siri, track food in Nouri" from the lock screen, describe your meal in one sentence, and keep both hands on the baby. Weekly Nouri Reports then show if your average is drifting too low.

Breastfeeding usually needs about 330 to 500 extra calories a day, and the first weeks are for healing, not dieting. Get your baseline from the daily calorie needs calculator, check it with your clinician, and if you want an easy way to make sure you are actually eating enough, try Nouri. When you are ready for the longer view, read what to expect from postpartum weight loss. You are doing an incredible job.

Sources

• CDC, Maternal Diet and Breastfeeding (last reviewed Aug 25, 2026), cdc.gov (checked Oct 23, 2026)
• ACOG, Breastfeeding Your Baby (patient FAQ), acog.org (checked Oct 23, 2026)
• National Academies of Sciences, Engineering, and Medicine, Dietary Reference Intakes for Energy, 2023, Summary, nationalacademies.org/read/26818/chapter/2 (checked Oct 23, 2026)
• Health Canada, Healthy eating when pregnant and breastfeeding, canada.ca (checked Oct 23, 2026)
• Health Canada, Prenatal Nutrition Guidelines for Health Professionals: Gestational Weight Gain, canada.ca (checked Oct 23, 2026)