How Many Calories Do You Burn Breastfeeding? (The Numbers Might Surprise You)
One of the most common things new mums are told is that breastfeeding will help them lose weight effortlessly. But before we get to that — how many calories burned breastfeeding per day are we actually talking about? The numbers are more interesting than most people realise.
How Many Calories Do You Actually Burn?
Breastfeeding burns roughly 300–500 extra calories per day, depending on how much you’re feeding and your baby’s age. That’s roughly the equivalent of a 45-minute jog — without leaving the couch.
For context:
- Exclusively breastfeeding burns more than partial breastfeeding
- Night feeds count too — your body doesn’t clock off at midnight
- Output increases as your baby grows and feeds more volume
What Affects How Much You Burn?
Not all breastfeeding burns the same amount. Here’s what changes the number:
How much your baby drinks — more milk produced means more calories burned. Simple.
Your baby’s age — a 4-month-old drinks significantly more than a newborn. Your calorie burn increases alongside their appetite.
Whether you’re exclusively breastfeeding — mixed feeding (combining breast and formula) means less milk production and proportionally fewer calories burned.
Your own metabolism — everyone’s baseline is different. Some women burn at the higher end of the range, others at the lower end.
How Does It Compare to Exercise?
Burning 300–500 calories a day is genuinely significant. To put it in perspective:
- 45 minutes of jogging: ~400 calories
- 1 hour of cycling: ~500 calories
- 30 minutes of swimming: ~300 calories
You’re doing the equivalent of a daily workout just by feeding your baby. That’s not nothing.
Why You Need to Eat More, Not Less
Here’s the part people get wrong. Because you’re burning more calories, your body needs more fuel — not less. The National Academies recommend breastfeeding women consume an extra 330–400 calories per day on top of their normal intake.
Eating too little doesn’t speed up weight loss while breastfeeding — it risks reducing your milk supply. Your body will protect milk production before it protects your waistline.
Eat enough. Your supply depends on it.
Wondering why the weight isn’t moving despite all those extra calories burned? That’s a different question — and we cover it in detail in our post on breastfeeding and weight loss.