How much milk should a newborn drink?

The figures, by age

Two notes on reading that table. The per-pound figure — about 2½ ounces of formula a day for every pound of body weight — is a cross-check rather than a prescription, and the AAP is explicit that babies will regulate their intake day to day to meet their own needs. And the daily ceiling of around 32 ounces matters: if your baby seems to want consistently more than that, it is worth raising with your pediatrician rather than simply making bigger bottles.

If you are breastfeeding and bottle feeding, the amounts above apply to what is in the bottle, not to the total. The AAP's guidance on how often and how much your baby should eat covers the breastfed side, and USDA WIC's combination feeding guidance is the best free resource for protecting supply while doing both.

Feed on demand, not to the table

The table is a sanity check for a worried parent at 2am, not a target to hit. The AAP's actual instruction for a formula-fed newborn is to feed on demand — whenever they cry with hunger — and to let them tell you when they have had enough.

What that looks like in practice: offer the bottle, let them pace it, and stop when they stop. Do not finish a bottle because there is an ounce left in it, and do not wake a settled newborn past the first weeks to hit a number unless your pediatrician has asked you to. Over-feeding a bottle is easier than over-feeding at the breast, because a bottle keeps delivering whether the baby is still hungry or not — which is the entire argument for paced bottle feeding, and it is the single most useful technique on this topic.

The signs that tell you more than ounces

Volume is the thing parents can measure, which is why it gets the attention. These are what clinicians actually look at.

• Weight gain at your pediatrician's appointments. This is the real answer to "is my baby getting enough", and it is not something you can assess at home with a bottle.
• Wet nappies. Steady, regular output through the day once feeding is established.
• Alertness and contentment between feeds, rather than frantic or persistently sleepy.
• Settling after a feed rather than still rooting and crying.

If any of those are off, that is a call to your pediatrician, not a reason to add an ounce. And if you are pumping, remember that what you get from a pump is a poor proxy for what a baby gets from a feed — a point worth holding onto before power pumping in response to a number.

What this means for the bottles you buy

The amounts above are why the standard advice to buy small bottles first is right, and why it only holds for a while.

Start with the smaller size. A newborn taking 1 to 2 ounces in a large bottle means a lot of wasted milk, awkward volume markings at the very bottom of the scale, and a pointlessly heavy bottle. Most ranges sell a 4oz-ish and an 8oz-ish size.

Expect to move up within a couple of months. By the time your baby is taking 6 to 8 ounces, the small bottles are a nuisance. Buy a bottle sold in both sizes so the nipples and rings carry over and you are not changing systems — which is one of the criteria in best baby bottles.

Do not buy a huge set of one size. How many you need depends on feeding style, and the arithmetic is in how many bottles do I need. If you are exclusively formula feeding, you need noticeably more than if half the feeds are at the breast — best bottles for formula feeding works that through.

If the bottle is going down too fast

A newborn draining a bottle in five minutes and then screaming is usually not a volume problem, it is a flow problem. A nipple flowing faster than the baby can manage delivers the milk before the feeling of fullness catches up, and they swallow air along the way.

The fix is the slowest flow nipple plus paced feeding, holding the bottle closer to horizontal and letting them take breaks. Which signs mean it is genuinely time to move up a flow level — and which mean the opposite — are in bottle nipple flow sizes. Never widen a nipple hole yourself.