How does the Breast Milk Intake Calculator work?

Newborns: ~150 mL/kg/day Then: From ~4–6 weeks: ~120 mL/kg/day Then: Divide daily total by number of feeds Then: Demand feeding is normal — amounts vary feed to feed.

Can you give an example of how to use the Breast Milk Intake Calculator?

Example: Input 5 kg baby, 2 months, 7 feeds/day gives a result of Daily ≈ 600 mL; per feed ≈ 86 mL.

Is the Breast Milk Intake Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Breast Milk Intake Calculator?

Our Breast Milk Intake Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Breast Milk Intake Calculator

Baby Weight (kg)

Baby Age (months)

Guideline: ~150 mL/kg/day under 1 month, ~120 mL/kg/day thereafter. Always confirm with your paediatrician.

A breast milk calculator estimates how much milk a baby needs per day and per feed. Adequate wet nappies (6+/day) and weight gain are the best indicators of sufficient intake.

Symbol	Name	Unit	Description
BabyWeight	Baby body weight	kg	—
DailyOutput	Daily milk production	mL	—
DayPostBirth	Days postpartum	Integer (1–180)	—

Age	mL/kg/day	Per feed (7 feeds, 5kg)
0–4 weeks	150	~107 mL
1–3 months	120	~86 mL
4–6 months	~100	~71 mL

References

›Breastfeeding — NHS

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Breast Milk Intake Calculator

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Milk Intake by Age

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Breast Milk Intake Calculator