How Much Breast Milk or Formula Does Your Baby Need?
🩺 Baby formula calculator: Find how many ml your baby needs per feeding by age and weight. Based on WHO & AAP guidelines. Quick and free.
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Reviewed by: Martín Rodríguez (editorial policy ) · Last reviewed:
Result
Amount per feeding
Your baby needs ~825 ml/day of formula, distributed across ~6 feedings of ~140 ml each.
Feedings per day
Estimated daily total
Note
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For guidance only — not medical advice. Consult a licensed healthcare professional.
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Knowing how much milk your baby needs is one of the most common questions in the first months. The amount varies by age, weight, and whether your baby is breastfeeding or formula feeding. This calculator gives you an estimate based on WHO and AAP (American Academy of Pediatrics) guidelines.
When to use this calculator
- Your newborn just arrived and you want to know how many ml to give per feeding.
- You're combining breastfeeding and formula and need to calculate the right amounts.
- Your pediatrician asked you to keep a feeding log.
- You're starting to pump and want to know how much milk you should be producing.
- You want to know if your baby is eating enough.
Infant Milk Intake by Age (WHO / AAP Guidelines)
| Age | Amount per feeding | Feedings per day | Estimated daily total |
|---|---|---|---|
| 0–2 weeks | 30–60 ml | 8–12 | 300–600 ml |
| 2–4 weeks | 60–90 ml | 8–10 | 500–700 ml |
| 1–2 months | 90–120 ml | 7–9 | 600–900 ml |
| 2–3 months | 120–150 ml | 6–8 | 750–950 ml |
| 3–4 months | 150–180 ml | 6–7 | 800–1,000 ml |
| 4–6 months | 150–210 ml | 5–6 | 800–1,000 ml |
| 6–9 months | 180–240 ml | 4–5 | 600–800 ml + solids |
| 9–12 months | 180–240 ml | 3–4 | 500–600 ml + solids |
Source: WHO Infant and Young Child Feeding / AAP (2026). Formula rule: 150 ml × weight (kg) = daily total (ages 1–5 months).
How it works
Milk Intake by Age
| Age | ml per feeding | Feedings/day | Daily total |
|---|---|---|---|
| 0-2 weeks | 30-60 ml | 8-12 | 300-600 ml |
| 2-4 weeks | 60-90 ml | 8-10 | 500-700 ml |
| 1-2 months | 90-120 ml | 7-9 | 600-900 ml |
| 2-3 months | 120-150 ml | 6-8 | 750-950 ml |
| 3-4 months | 150-180 ml | 6-7 | 800-1000 ml |
| 4-6 months | 150-210 ml | 5-6 | 800-1000 ml |
| 6-9 months | 180-240 ml | 4-5 | 600-800 ml + solids |
| 9-12 months | 180-240 ml | 3-4 | 500-600 ml + solids |
Formula Feeding Rule
ml/day = weight (kg) × 150This applies from 1 month to 4-5 months of age. After that, solid foods are introduced and milk intake decreases.
Breastfeeding: How to Know if Baby is Getting Enough
With exclusive breastfeeding, you can't measure ml, but these signs show your baby is eating well:
Related Calculators
Example: 3-month-old baby, 5.5 kg, formula feeding
Age: 3 months. Weight: 5.5 kg.
Formula rule: 150 ml/kg/day = 825 ml/day.
Feedings: ~6 per day.
Per feeding: ~140 ml.
Your baby needs ~825 ml/day of formula, distributed across ~6 feedings of ~140 ml each.
Disclaimer: Los resultados son orientativos y no reemplazan la consulta médica profesional. Antes de tomar decisiones con impacto, consultá con un médico, nutricionista o profesional de la salud matriculado.
Frequently asked questions
How much milk should a newborn drink per feeding?
A newborn typically drinks 30-60 ml per feeding during the first 2 weeks, with 8-12 feedings per day. A newborn's stomach is the size of a cherry (5 ml) at birth, but grows quickly over the first weeks.
How do I know if my breastfed baby is getting enough milk?
Signs of good breastfeeding: 6-8 wet diapers per day, steady weight gain at pediatric visits, baby seems satisfied after feeding, and at least 2-3 stools daily in the first month.
Does the 150 ml/kg rule work for all babies?
It's a general guideline for formula feeding. Some babies need more (up to 180 ml/kg) and others less. What matters most is that your baby gains weight steadily and seems satisfied. Your pediatrician will adjust based on your baby's needs.
At what age does baby need less milk?
Starting at 6 months, solid foods are introduced and milk intake gradually decreases. By 12 months, milk is around 500-600 ml/day and solid foods become the main source of nutrition.
Can you overfeed a baby with a bottle?
Yes, it's easier to overfeed with a bottle than breastfeeding. Formula flows faster and babies may drink more than they need. Use a slow-flow nipple, take feeding breaks, and watch for hunger/fullness cues (turning head, closing mouth).
Does breast milk and formula have the same calories?
Roughly yes: both have about 67 kcal/100 ml. The main difference is that breast milk contains antibodies, enzymes, and growth factors that formula can't replicate.
When should I stop giving formula?
WHO recommends breast milk until 2 years or beyond. Stage 1 infant formula is used until 6 months, then Stage 2 follow-up formula until 12 months. After that, whole cow's milk can be introduced.
How many ml should my 3-month-old drink per day?
A 3-month-old typically needs 600-900 ml per day in 6-7 feedings, or about 120-150 ml per feeding. Use the calculator above to get a personalized estimate based on your baby's age and weight.
Sources & references
Methodology & trust
Editorial
Calculadora de salud revisada por el equipo editorial de Hacé Cuentas, contrastada con WHO — Infant and Young Child Feeding, según nuestra política editorial y metodología.
Updates
Última revisión: June 20, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.
Privacy
Calculations run 100% in your browser. We do not store or transmit your data.
Limitations
Indicative results. For critical decisions, consult a professional.
📌 How to cite this calculator
Rodríguez, M. (2026). How Much Breast Milk or Formula Does Your Baby Need?. Hacé Cuentas. https://hacecuentas.com/breast-milk-formula
Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.