Feeding by age · Week 12
How much should a 12-week-old eat?
Last reviewed November 2026 against AAP, CDC, NHS and WHO guidance · Sources
Quick answer
Most 12-week-olds take about 4–6 oz (120–180 ml) of formula or expressed breast milk per feed, 5–6 times in 24 hours, for roughly 24–32 oz (720–960 ml) a day. Breastfed babies usually nurse 7–9 times a day. A growth spurt around 3 months can bring a few hungrier days. Follow your baby's cues.
- Per feed
- 4–6 oz (120–180 ml)
- Feeds / 24h
- 5–6
- Daily formula
- 24–32 oz (720–960 ml)
On this page
- How much should a 12-week-old eat?
- What's happening at 12 weeks?
- How much formula does a 12-week-old need by weight?
- Sample 12-week-old feeding schedule
- What are hunger and fullness cues at 12 weeks?
- Is there a growth spurt at 12 weeks?
- What changes next week?
- When to call your pediatrician
- Questions parents ask
- Sources
How much should a 12-week-old eat?
| Formula | Breast milk | |
|---|---|---|
| Per feed | 4–6 oz (120–180 ml) | 3–5 oz (90–150 ml) per bottle of expressed milk; at the breast, your baby leads |
| Feeds in 24 hours | 5–6 | 7–9 breastfeeds |
| Daily total | 24–32 oz (720–960 ml) | About 750 ml (25 oz) |
| Typical gap | Every 3–4 hours, sometimes 4–5 | Every 2–4 hours |
What's happening at 12 weeks?
Twelve weeks often brings a growth spurt (USDA WIC lists one around 3 months). Expect a few hungrier days.
Formula-fed babies often take 4–6 oz (120–180 ml) per feed, 5–6 times a day. Breast milk intake stays around 750 ml (25 oz) a day from 1 to 6 months (HSE), so breastfed babies don't need ever-bigger bottles.
Some babies sleep longer at night now; others don't yet. The AAP says many formula-fed babies drop the middle-of-the-night feed somewhere between 2 and 4 months.
How much formula does a 12-week-old need by weight?
The AAP's rule of thumb uses weight instead of age: about 2½ oz of formula per pound of body weight a day, and no more than about 32 oz (960 ml). In the UK, the NHS uses a similar guide of 150–200 ml per kg a day after the first week. Both are rough checks, not targets.
| Baby's weight | Per day (AAP, 2½ oz per lb) | Per feed at 5–6 feeds |
|---|---|---|
| 11 lb (5 kg) | About 27.5 oz (825 ml) | 4.5–5.5 oz (135–165 ml) |
| 12.5 lb (5.7 kg) | About 31.5 oz (945 ml) | 5.5–6.5 oz (165–195 ml) |
| 14 lb (6.4 kg) | About 32 oz (960 ml), the 32 oz ceiling | 5.5–6.5 oz (165–195 ml) |
Sample 12-week-old feeding schedule
| Time | What happens |
|---|---|
| 6:00 am | Milk feed: 4–6 oz (120–180 ml) bottle, or a breastfeed |
| 9:30 am | Milk feed: 4–6 oz (120–180 ml) bottle, or a breastfeed |
| 1:00 pm | Milk feed: 4–6 oz (120–180 ml) bottle, or a breastfeed |
| 4:30 pm | Milk feed: 4–6 oz (120–180 ml) bottle, or a breastfeed |
| 7:30 pm | Milk feed: 4–6 oz (120–180 ml) bottle, or a breastfeed |
| 10:30 pm | Milk feed: 4–6 oz (120–180 ml) bottle, or a breastfeed |
This sample has no middle-of-the-night feed. Plenty of 12-week-olds still need one, and that's okay. Responsive feeding (offering milk when your baby shows hunger cues) matters more than the clock.
What are hunger and fullness cues at 12 weeks?
Hungry
- Hands to mouth and lip smacking, even mid-play
- Turning toward the breast or reaching for the bottle
- Fussing that settles as soon as a feed starts
- Waking earlier than usual from a nap
Full
- Pulls off to look around and doesn't go back
- Pushes the bottle away or closes mouth
- Relaxed hands, happy babbling
- Gets playful or squirmy instead of sucking
Is there a growth spurt at 12 weeks?
Growth spurt notes
A 3-month growth spurt is common (USDA WIC). For a few days your baby may want extra feeds or bigger bottles, then settle back.
What changes next week?
Through the third month (see the 3-month-old guide), many formula-fed babies move toward 5–6 oz (150–180 ml) bottles.
Read next: How much should a 3-month-old eat?
When to call your pediatrician
- A rectal temperature of 100.4°F (38°C) or higher in a baby 3 months or younger. The AAP says to call right away, even if your baby seems otherwise well.
- Fewer wet diapers than expected for their age (fewer than 6 a day from about day 5), or dark yellow urine.
- Very sleepy and hard to wake for feeds, floppy, or unusually quiet.
- Refusing feeds, or feeding poorly several times in a row.
- Signs of dehydration: dry mouth, no tears, or a sunken soft spot on the head.
- Forceful or green vomiting, or vomiting after most feeds.
- Red, black (after the first meconium poops) or white/pale gray poop.
- Yellow skin or eyes that spread or deepen, or any yellow color in the first 24 hours.
- Trouble breathing, blue or gray lips, or your baby is limp or very hard to wake: call 911 (or your local emergency number) now.
If something feels wrong, trust that feeling and call. You never need a reason beyond worry.
Questions parents ask
How much should a 12-week-old eat?
Usually about 4–6 oz (120–180 ml) of formula per feed, 5–6 times a day, for roughly 24–32 oz (720–960 ml). Breastfed babies nurse about 7–9 times in 24 hours and take around 750 ml (25 oz) of milk a day.
Is there a 12-week growth spurt?
Often, yes. USDA WIC lists a growth spurt around 3 months. It usually lasts a few days. More frequent feeds during that time are normal for breastfed and formula-fed babies.
Do I need to increase bottle size at 12 weeks?
Only if your baby asks for it. If they finish bottles and still show hunger cues, try adding about 1 oz (30 ml). If they often leave milk behind, the current size is probably right.
How do I know my 12-week-old is getting enough milk?
Look at diapers and growth more than ounces. Six or more wet diapers a day, regular poops, a baby who seems content after most feeds, and steady weight gain at checkups are the signs the AAP points to. If any of these slip, call your pediatrician.
Related guides
- Baby feeding chart by age: ounces and mlA baby feeding chart from week 1 to 12 months: ounces and ml per feed, feeds per day and daily totals for formula and breast milk, with sources.
- How to tell if your baby is getting enough breast milkSigns a breastfed baby is getting enough: wet and dirty diapers by day, weight gain, swallowing and contentment after feeds, plus the warning signs to act on.
- Cluster feeding: what's normal and how to get through itCluster feeding is feeds bunched together, often in the evening. When it happens, how long it lasts, how to tell it from low supply, and how to cope.
- Newborn feeding schedule: what a day really looks likeSample newborn feeding schedules for breastfed, formula-fed and combo-fed babies, from the first week to 3 months, with feeds per day and gaps between feeds.
- Paced bottle feeding, step by stepHow to pace a bottle feed: positioning, a horizontal bottle, breaks every few sucks and fullness cues. Works for breast milk and formula, and for every caregiver.
Free tools
Sources
Last reviewed November 2026. Numbers are ranges from these public health sources; 1 oz ≈ 30 ml.
- USDA WIC Breastfeeding Support: Cluster Feeding and Growth Spurts
- HSE (Ireland's public health service): How much breast milk to express
- AAP · HealthyChildren.org: How Much Formula Does My Baby Need?
- AAP · HealthyChildren.org: Amount and Schedule of Formula Feedings
- AAP · HealthyChildren.org: Fever and Your Baby
- AAP · HealthyChildren.org: How to Tell if Your Breastfed Baby is Getting Enough Milk
Feedoo Baby shares general information, not medical advice. Every baby is different. If you're worried about feeding, weight gain, diapers or your baby's health, call your pediatrician, midwife or health visitor.