# Breast Milk Intake Calculator

URL: https://speedycalculator.com/calculators/health/babys-milk-intake/
Last updated: 2026-10-30

> The breast milk intake calculator estimates how much breast milk a baby needs per day and per bottle when feeding expressed milk, based on age – breastfed babies take about 750–1,035 mL (25–35 oz) a day from 1 to 6 months.

## Inputs

- Age (months, years, weeks)
- Feeds per day

## Results

- Breast milk per day
- Per bottle
- Typical range from
- Typical range to

## Formula

```
Days 1–7: about 30–60 mL per feed, rising daily
1–6 months: about 750–1,035 mL per day (average ≈ 800 mL)
Per bottle = daily amount ÷ feeds per day
```

## Explanation

Unlike formula intake, breast milk intake stays fairly constant from about 1 month to 6 months, because breast milk changes composition as the baby grows. This helps parents and carers prepare bottles of expressed milk.

### How to use the Breast Milk Intake Calculator

- **Age**
- **Feeds per day**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter your baby's age and how many feeds a day.

### Inputs explained

FieldWhat to enterAgeUnits: months, years, weeksFeeds per dayA number

### Example values

How the main result changes when **Age** changes and everything else stays at the example values above:

Age (months)Breast milk per day (mL)1.58002.2580038003.758004.58006800
*Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.*

## Worked example

Inputs — Age: 3 months; Feeds per day: 8.

Results — **Breast milk per day = 800 mL**; Per bottle = 100 mL; Typical range from = 750 mL; Typical range to = 1,035 mL.

## Key terms

- **Expressed milk**: Breast milk pumped or hand-expressed for bottle feeding.

## FAQ

**How much expressed milk should a bottle contain?**
Often 90–120 mL (3–4 oz) for babies 1–6 months, depending on feeds per day.

**Why does breast milk intake not increase like formula?**
Breast milk becomes more energy-dense and babies grow more slowly after the first months.

**How do I know my baby is getting enough?**
Steady weight gain and 6 or more wet nappies a day after the first week.


## Sources

- [Kellymom – How much expressed milk will my baby need?](https://kellymom.com/bf/pumpingmoms/pumping/milkcalc/)
- [Kent JC et al. Volume and frequency of breastfeedings and fat content of breast milk throughout the day. Pediatrics, 2006](https://pubmed.ncbi.nlm.nih.gov/16510619/)