Key Takeaways

Newborns start with 1 to 3 ounces per feed, 8 to 12 times in 24 hours, and reach at least 4 ounces per feed by the end of the first month.

The working rule after that: about 2.5 ounces of formula per day for every pound of body weight, across 6 to 8 feeds.

At 4 to 6 months most infants take 20 to 40 ounces a day and start showing readiness for solids; from 6 to 12 months, formula or solids about 5 to 6 times a day, with formula falling as solids rise.

Iron-fortified formula until 12 months, no regular cow’s milk before 1, and 32 ounces a day is the vitamin D line.

The short answer

How much formula your baby needs is a moving target, but it moves along a predictable curve: small and frequent at first, bigger and spaced out later. Anchor on the table, then read the section for your baby’s age.

Age	Per feed	Per day (approx)	Times per 24 hours
First days	1 to 2 oz	16 to 24 oz	8 to 12
End of first month	At least 4 oz	About 24 to 32 oz	6 to 8
1 to 3 months	4 oz, climbing toward 6 to 8 oz	Weight rule: 2.5 oz per lb	6 to 8, decreasing
4 to 6 months	6 to 8 oz	20 to 40 oz	4 to 6, plus emerging solids
6 to 12 months	6 to 8 oz, falling as solids rise	Falling as solids rise	Formula or solids 5 to 6 times

Per-feed figures for the first days and the 6-to-12-month pattern come from the CDC ¹; the monthly ladder, daily totals, and the weight rule come from MedlinePlus and the AAP ²³. Every baby is different, so treat the table as a starting range and let hunger cues and your pediatrician set the exact numbers. For the feed-frequency side of the same question, our newborn feeding guide covers both breast and bottle.

The one rule worth memorizing

On average, a baby needs about 2.5 ounces (75 mL) of formula a day for every pound (453 g) of body weight ³². A 10-pound baby lands around 25 ounces a day; a 14-pound baby around 35. It is a planning estimate, not a prescription: some days run higher during growth spurts, some lower, and your pediatrician’s growth curve is the final judge.

First days: small belly, small feeds

Your newborn’s belly is tiny, so each feed is small: 1 to 2 ounces every 2 to 3 hours if taking only formula, more when your baby shows hunger signs ¹. Most formula-fed newborns feed 8 to 12 times in 24 hours.

MedlinePlus frames the same start slightly higher, 2 to 3 ounces per feed for a daily total of 16 to 24 ounces ². The two ranges overlap, and the practical advice is identical: start small, offer more on hunger cues, and confirm the amount with your baby’s doctor in the first days.

Sleepy newborns may need waking to feed every 2 to 4 hours at first, and a formula-fed baby should not sleep more than 4 to 5 hours at night without feeding ⁴. Waking them for the feed is fine.

First month: reaching 4 ounces

Over the first weeks, your baby’s belly grows and each feed grows with it. By the end of the first month, your baby should be up to at least 4 ounces per feeding ², with intervals stretching toward every 3 to 4 hours. Total feeds per day drift down from the newborn 8 to 12 toward roughly 6 to 8.

Feeds vary in length, long sometimes, short other times. Babies generally take what they need and stop when full.

1 to 6 months: the steady climb

From here the pattern is simple: fewer feeds, bigger bottles. Amounts climb toward approximately 6 to 8 ounces per feeding as the baby grows ². At 4 to 6 months, most infants consume 20 to 40 ounces a day.

This is also when solids enter the picture. Do not give solid food before 4 to 6 months: your baby will not digest it well and may choke ⁴. Readiness signs include doubled birth weight, good head and neck control, sitting with some support, turning away to signal fullness, and interest in food when others eat. Our newborn schedule by week shows how the feeding rhythm looks just before this transition.

6 to 12 months: formula plus solids

Most 6-to-12-month-olds need formula or solid foods about 5 to 6 times in 24 hours ¹. As solids gradually rise, formula gradually falls. Keep offering formula on hunger cues through the transition rather than cutting it on a schedule.

Two lines that hold all year: use iron-fortified formula, since the AAP recommends breast milk or iron-fortified formula until at least 12 months ². And no regular cow’s milk before age 1: babies under 1 have a hard time digesting it ⁴.

One threshold to know: babies getting about 32 ounces or more of formula a day do not need extra vitamin D, because formula is fortified with it. Below that line, vitamin D drops starting shortly after birth ¹.

12 months: switching to cow’s milk

At 12 months you can switch from formula to plain whole cow’s milk, not skim or reduced-fat ¹². Do it gradually: replacing one formula feed with cow’s milk at a time helps your child transition. Toddler formulas have not been shown to beat whole milk plus a varied diet, so there is no need to detour through them.

How to tell your baby is getting enough

Three signals, same as with any feeding method:

Hunger cues, early: hands to mouth, rooting toward the bottle, lip smacking, clenched hands. Crying is a late sign, so do not wait for it ⁵.
Fullness cues: closing the mouth, turning away from the bottle, relaxing the hands. Let your baby decide when the feed ends; they do not need to finish the bottle.
Diapers and weight: a steady stream of wet and dirty diapers plus a healthy weight curve at checkups. If you are worried in either direction, too little or too much, that visit is the place to ask.

Logging feeds with ounces for a few days turns vague worry into concrete numbers. Our feeding tracker records a bottle with one tap, and our guide to what to track in your baby’s first year explains which logs pair with it.

Frequently asked questions

How many ounces of formula does a newborn need?

In the first days, 1 to 2 ounces every 2 to 3 hours, 8 to 12 times a day, offering more on hunger signs. MedlinePlus describes the same start as 2 to 3 ounces per feed totaling 16 to 24 ounces a day. Start small and confirm with your pediatrician.

How do I calculate how much formula my baby needs?

Use about 2.5 ounces per day for every pound of body weight. A 12-pound baby lands around 30 ounces a day, split across that day’s feeds.

How much formula should a 6-month-old drink?

At 4 to 6 months most infants take 20 to 40 ounces a day. From 6 months, formula or solids about 5 to 6 times a day, with formula falling as solids rise.

When can my baby switch to cow’s milk?

At 12 months, switching gradually to plain whole milk. No regular cow’s milk before age 1.

Does my formula-fed baby need vitamin D drops?

Only below about 32 ounces of formula a day. At or above that, the fortification in the formula covers it. Ask your pediatrician if you are unsure.

Should I wake my baby to feed at night?

Early on, yes if feeds are due: newborns may need waking every 2 to 4 hours, and a formula-fed baby should not go more than 4 to 5 hours overnight without feeding. Once growth is on track, your pediatrician will tell you when to stop waking.

Disclaimer: This article is for informational purposes only and does not constitute medical advice. Every baby is different. Always consult your pediatrician with questions about your baby’s feeding, growth, or health.

CDC, “How Much and How Often to Feed Infant Formula,” Infant and Toddler Nutrition, reviewed April 21, 2026. Source ↩ ↩² ↩³ ↩⁴ ↩⁵
MedlinePlus (U.S. National Library of Medicine), “Infant formulas,” Medical Encyclopedia, reviewed April 5, 2025. Source ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷
AAP, “Amount and Schedule of Baby Formula Feedings,” HealthyChildren.org, updated May 16, 2022. Source ↩ ↩²
MedlinePlus (U.S. National Library of Medicine), “Feeding patterns and diet - babies and infants,” Medical Encyclopedia, reviewed July 1, 2025. Source ↩ ↩² ↩³
CDC, “Signs Your Child Is Hungry or Full,” Infant and Toddler Nutrition, reviewed March 11, 2026. Source ↩