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How much milk does my baby need?

Last verified: July 17, 2026

Illustration of a baby bottle with measurement lines and a small heart

The short answer: newborns take small amounts that grow fast, roughly 1 to 2 ounces a feed in week one, climbing to 3 to 4 ounces by the end of month one, and 6 to 8 ounces by 6 months. But the number on the bottle matters less than two things: whether your baby is showing hunger and fullness cues, and whether nappies and weight gain look right. Babies are surprisingly good at telling you how much they need, if you let them.

The rough numbers, by age

These figures are for formula, since that is where exact amounts are easiest to give. If you are breastfeeding, your baby’s intake works the same way but is harder to measure directly, so nappy output and weight checks matter even more.

  • First week: about 1 to 2 ounces (30 to 60ml) per feed, roughly every 2 to 3 hours, at least 8 times in 24 hours.
  • By the end of the first month: 3 to 4 ounces (90 to 120ml) per feed, about every 3 to 4 hours.
  • By 6 months: 6 to 8 ounces (180 to 240ml) at each of 4 to 5 feeds a day, alongside solid food starting around this age.

As a general weight-based rule, the AAP suggests about 2.5 ounces (75ml) of formula a day for every pound of body weight, with an upper limit of roughly 32 ounces a day for most babies. That is a ceiling to sanity-check against, not a target to hit every day (AAP: Amount and Schedule of Baby Formula Feedings).

The NHS takes a deliberately less numeric approach: newborns need small amounts that vary from baby to baby, and the goal is to feed on demand rather than chase a fixed volume (NHS: Formula milk, common questions). Both organisations agree on the thing that matters most: your baby regulates their own intake far better than any chart can.

Feed the baby, not the clock

Try to catch hunger before crying starts, since crying is a late sign and can make it harder for your baby to settle and feed well. Earlier cues include restlessness, turning the head and opening the mouth (called rooting), and sucking on a fist or fingers (NHS; AAP: How Often and How Much Should Your Baby Eat?). Other cues the AAP lists: lip licking, tongue out, a hand going repeatedly to the mouth, and general fussiness.

Babies feed little and often at first, and a big feed does not necessarily buy you a longer stretch before the next one. Do not worry if your baby leaves milk in the bottle. Follow their lead rather than finishing what you poured (NHS: Bottle feeding advice).

If your newborn sleeps longer than 4 to 5 hours in the first few weeks and starts missing feeds, it is fine to wake them gently and offer a bottle. This matters more if your baby was born a little early or is slow to gain weight (AAP).

Signs your baby is getting enough

This is the part worth actually checking, more than the ounces:

  • Wet nappies. Around 6 a day from a few days after birth, wet with clear or pale yellow urine, or feeling noticeably heavy (NHS). In the very first days after birth, expect fewer: 2 to 3 wet nappies a day is normal before your milk or feeding routine is fully established, rising to at least 5 to 6 a day after day 4 or 5 (AAP).
  • Dirty nappies. At least 1 a day after the first week, moving from the dark, sticky meconium of the first day or two to a pale yellow or yellowish brown poo. By around day 4, at least 4 stools a day is typical, though this varies by feeding type. Our guide to normal baby poop covers the full range of colours and textures.
  • Steady weight gain. Checked at birth, again in the first week, then at 8, 12, and 16 weeks, and at 1 year. Your midwife or health visitor tracks this in your baby’s personal child health record, the red book (NHS).

If your baby is consistently hitting these marks, you can stop doing mental arithmetic over the bottle. If you have any doubt at all, that is reason enough to ask your health visitor or GP.

What overfeeding looks like

Bottle feeding can make overfeeding easier than breastfeeding, simply because milk flows faster and it takes less effort to keep sucking even after your baby is full. Watch for fussiness during transitions, like when you take the bottle away, and for signs such as stomach pain, gas, or frequent spitting up (AAP). Offering slightly less than you think your baby wants is usually the safer bet, since you can always offer more.

If your baby brings up milk often after feeds, that is usually ordinary spitting up rather than a feeding problem. Our guide to reflux and spitting up walks through when it is nothing to worry about and when it is not.

One more note on formula itself: always use the amount of powder printed on the packaging. Adding extra powder to make feeds go further can cause constipation and dehydration, so resist that urge even on a hard day (NHS: Bottle feeding advice).

When feeding needs change

Somewhere between 2 and 4 months, or once your baby weighs more than around 12 pounds (5.4kg), most formula-fed babies stop needing a middle-of-the-night feed. Daytime feeds become bigger and more spaced out, sometimes up to 4 or 5 hours apart, as your baby’s stomach capacity grows (AAP). Around 6 months, solid food joins the picture. Our guide to starting solids covers the real signs of readiness.

When to call your doctor

Talk to your midwife, health visitor, or GP if your baby seems to want much more or much less than these ranges on a consistent basis, if weight gain is slow, or if you are struggling to tell whether your baby is hungry or full. If your baby is under 8 weeks old and has not passed a poo in 2 to 3 days, especially alongside slow weight gain, that is also worth a call (NHS). Preterm babies or babies with certain medical conditions often need a scheduled feeding plan from their pediatrician rather than feeding purely on demand (AAP). And as always, your own concern is reason enough to ask.

Keep reading

Sources

Peanutbean provides general information for educational purposes only. It is not medical advice. Every baby develops at their own pace. Always talk to your pediatrician about your child’s health.

Common questions

How many ounces of formula should my baby have?

It rises fast in the early weeks: about 1 to 2 ounces (30 to 60ml) per feed in the first week, 3 to 4 ounces (90 to 120ml) per feed by the end of the first month, and 6 to 8 ounces (180 to 240ml) at 4 to 5 feeds a day by 6 months. Most babies average around 2.5 ounces per pound of body weight a day, capped at roughly 32 ounces.

How do I know if my baby is getting enough milk?

Watch nappies and weight, not the clock. From a few days after birth, look for around 6 wet nappies a day with pale or clear urine, at least 1 to 2 dirty nappies, and steady weight gain at checkups. A baby who feeds well and settles between feeds is almost always getting enough.

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Peanutbean provides general information for educational purposes only. It is not medical advice. Every baby develops at their own pace. Always talk to your pediatrician about your child's health.