Free baby sleep tools
🍼 Baby formula amount calculator
Formula-fed babies usually take a fairly predictable amount for their weight in the early months. Enter your baby’s weight and age for a typical range.
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Typical formula by weight (first months)
| Weight | Per day | Per day (oz) |
|---|---|---|
| 3 kg | 450 to 600 ml | 15 to 20 oz |
| 3.5 kg | 530 to 700 ml | 18 to 24 oz |
| 4 kg | 600 to 800 ml | 20 to 27 oz |
| 4.5 kg | 680 to 900 ml | 23 to 30 oz |
| 5 kg | 750 to 1000 ml | 25 to 34 oz |
| 5.5 kg | 830 to 1000 ml | 28 to 34 oz |
| 6 kg | 900 to 1000 ml | 30 to 34 oz |
| 6.5 kg | 980 to 1000 ml | 33 to 34 oz |
| 7 kg | 1000 to 1000 ml | 34 to 34 oz |
How the range is worked out
In the first months, most formula-fed babies take about 150 to 200 ml per kilogram of body weight a day, levelling off at around a litre. The range is wide because appetite varies from day to day and baby to baby.
Responsive bottle feeding
Paced feeding, pauses to burp and letting your baby stop when they turn away all help them stay in charge of how much they take. It is fine if they do not finish a bottle.
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Questions parents ask
Frequently asked questions
How much formula should a newborn have?
In the first days, very small amounts, building up over the first week. By about a week old, most take roughly 150 to 200 ml per kilogram a day, spread over 7 to 8 feeds.
How many ounces does a 2 month old drink?
Often around 4 to 5 oz per feed, 5 to 7 times a day, depending on weight and appetite.
What if my baby wants more than the calculator says?
Babies have hungrier days, especially in growth spurts. If your baby regularly wants much more or much less, check in with your health visitor or GP.
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OBubba tools give general, age-based information. They are not medical advice and do not diagnose anything. Every baby is different. If you are worried about your baby, speak to your health visitor, midwife, GP or call NHS 111 (or your local equivalent).