Feeding by age · Week 9
How much should a 9-week-old eat?
Last reviewed November 2026 against AAP, CDC, NHS and WHO guidance · Sources
Quick answer
Most 9-week-olds take about 4–5 oz (120–150 ml) of formula or expressed breast milk per feed, 5–7 times in 24 hours, for roughly 24–32 oz (720–960 ml) a day. Breastfed babies usually nurse 7–9 times a day. Distracted, social feeds are common at this age. Follow your baby's cues.
- Per feed
- 4–5 oz (120–150 ml)
- Feeds / 24h
- 5–7
- Daily formula
- 24–32 oz (720–960 ml)
On this page
How much should a 9-week-old eat?
| Formula | Breast milk | |
|---|---|---|
| Per feed | 4–5 oz (120–150 ml) | 3–5 oz (90–150 ml) per bottle of expressed milk; at the breast, your baby leads |
| Feeds in 24 hours | 5–7 | 7–9 breastfeeds |
| Daily total | 24–32 oz (720–960 ml) | About 750 ml (25 oz) |
| Typical gap | Every 3–4 hours | Every 2–4 hours |
What's happening at 9 weeks?
Nine weeks is usually a steady stretch. Bottles of 4–5 oz (120–150 ml) are typical, and some babies take more at the first morning feed after a longer night.
Babies are more social now: smiling, cooing, looking around. Daytime feeds can get distracted. A dim, quiet spot and a burp break often help.
If you're heading back to work soon, this is a good time to practice bottles and work out how much breast milk to leave.
How much formula does a 9-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 5–7 feeds |
|---|---|---|
| 10 lb (4.5 kg) | About 25 oz (750 ml) | 3.5–5 oz (105–150 ml) |
| 11 lb (5 kg) | About 27.5 oz (825 ml) | 4–5.5 oz (120–165 ml) |
| 12.5 lb (5.7 kg) | About 31.5 oz (945 ml) | 4.5–6.5 oz (135–195 ml) |
Sample 9-week-old feeding schedule
| Time | What happens |
|---|---|
| 4:00 am | Milk feed: 4–5 oz (120–150 ml) bottle, or a breastfeed |
| 7:30 am | Milk feed: 4–5 oz (120–150 ml) bottle, or a breastfeed |
| 11:00 am | Milk feed: 4–5 oz (120–150 ml) bottle, or a breastfeed |
| 2:30 pm | Milk feed: 4–5 oz (120–150 ml) bottle, or a breastfeed |
| 5:30 pm | Milk feed: 4–5 oz (120–150 ml) bottle, or a breastfeed |
| 8:00 pm | Milk feed: 4–5 oz (120–150 ml) bottle, or a breastfeed |
| 10:30 pm | Milk feed: 4–5 oz (120–150 ml) bottle, or a breastfeed |
A dream feed around 10:30 pm, before you go to bed, helps some families get a longer stretch. Responsive feeding (offering milk when your baby shows hunger cues) matters more than the clock.
What are hunger and fullness cues at 9 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
What changes next week?
By week 10 some babies move up to 5–6 oz (150–180 ml) bottles.
Read next: How much should a 10-week-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 9-week-old eat?
Usually about 4–5 oz (120–150 ml) per feed, 5–7 times a day, for a total of roughly 24–32 oz (720–960 ml). Breastfed babies often nurse 7–9 times in 24 hours.
Why does my 9-week-old pull off the bottle to look around?
Babies get more alert and curious at this age, so short, distracted feeds are common. Feeding in a quiet room and offering again after a short break usually helps. If total intake or wet diapers drop for more than a day, call your pediatrician.
How much breast milk should I pump for daycare?
One starting point is the HSE figure of about 750 ml (25 oz) a day for babies 1 to 6 months, divided by the number of feeds. With 8 feeds a day, that's roughly 3 oz (90 ml) per bottle. Adjust to your baby's appetite.
How do I know my 9-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.
- 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.
- AAP · HealthyChildren.org: How Much Formula Does My Baby Need?
- HSE (Ireland's public health service): How much breast milk to express
- CDC: How Much and How Often to Breastfeed
- 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.