Breast Milk Calculator
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Exclusively breastfed babies between 1 and 6 months usually drink about 25 oz (750 mL) a day, in a range of 19 to 30 oz. With 8 feeds that is about 3 oz per bottle; for 10 hours at daycare, plan about 10 oz.
| Typical daily intake (1 to 6 months) | about 25 oz (750 mL), range 19 to 30 oz |
| Feeds per day | 8 |
| Per bottle | 3.1 oz (92 mL) |
| For 10 hours away | about 10 oz (308 mL), in 4 bottles |
| Storage (CDC) | room temperature up to 4 hours; fridge up to 4 days; freezer about 6 months is best |
Show steps
- Exclusively breastfed babies from 1 to 6 months drink about the same each day, around 25 oz (19 to 30 oz), because breast milk changes in composition as they grow.
- Per bottle = daily amount ÷ feeds per day = 25 ÷ 8 = 3.1 oz.
- For time away: daily amount × hours ÷ 24.
Why breast milk amounts stay steady
Unlike formula, breast milk intake does not climb much between 1 and 6 months: the milk changes in composition as the baby grows. That is why a per-pound rule overestimates bottles for older breastfed babies.
Storing pumped milk (CDC)
- Room temperature (up to 77 °F): up to 4 hours.
- Refrigerator: up to 4 days.
- Freezer: best within 6 months, acceptable up to 12.
- Use thawed milk within 24 hours; do not refreeze.
Tips
Store milk in 2 to 4 oz portions to reduce waste, and send one extra small bottle for growth spurts.
Breast Milk Calculator quiz: 10 questions
Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.
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Frequently asked questions
How many ounces of breast milk per bottle?
Often 3 to 4 oz for babies 1 to 6 months.
How much milk for daycare?
About 1 to 1.25 oz per hour away; the calculator gives a total.
Does a bigger baby need more breast milk?
Not much between 1 and 6 months; intake stays fairly steady.
How long does pumped milk last?
4 hours at room temperature, 4 days in the fridge, about 6 months in the freezer (best quality).
My baby drinks more than this. Is it okay?
Babies vary; paced bottle feeding helps them self-regulate. Ask your pediatrician.
Sources
- CDC: Proper Storage and Preparation of Breast Milk
- Kent et al. (2006), Volume and frequency of breastfeedings, Pediatrics 117(3)
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