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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.

What is Breast Milk Intake Calculator?

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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.

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Vzorec

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f(x)

Output estimate = 150 mL/kg/day typical by day 5–7 (e.g., 3.5 kg baby = 525 mL/day); Increases gradually to 750–900 mL/day month 1–6

Variable Legend

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Symbol	Meno	Jednotka	Popis
BabyWeight	Baby body weight	kg	—
DailyOutput	Daily milk production	mL	—
DayPostBirth	Days postpartum	Integer (1–180)	—

How to Breast Milk Intake Calculator

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1Newborns: ~150 mL/kg/day
2From ~4–6 weeks: ~120 mL/kg/day
3Divide daily total by number of feeds
4Demand feeding is normal — amounts vary feed to feed

Worked Examples

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Example 1

Given:5 kg baby, 2 months, 7 feeds/day

Výsledok:Daily ≈ 600 mL; per feed ≈ 86 mL

Real-World Applications

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Postpartum milk production monitoring

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Supplementation decision-making

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Pumping schedule planning

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Breastfeeding adequacy assessment

Milk Intake by Age

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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

Frequently Asked Questions

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How do I know if baby is getting enough?

6+ wet diapers, 2–5 dirty diapers/day (day 2+). Weight check: back to birth weight by day 10–14, gain 15–30 g/day month 1–3. Healthcare provider monitors.

What affects milk supply?

Frequent feeding (8–12x/day month 1) stimulates supply. Dehydration, stress, poor latch reduce it. Medications (some), retained placenta increase risk of low supply.

Is pumping output = actual feeding output?

No. Pumps less efficient than baby at extracting milk. Baby + pump output > pump alone. Use baby's feeding patterns (wet diapers, weight) to assess adequacy.

References

›Breastfeeding — NHS

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Accuracy-checked

Reviewed October 2026

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