Newborn, day by day · Day 12
Newborn day 12: diapers, poop and feeding
Last reviewed November 2026 against AAP, CDC, NHS and WHO guidance · Sources
Quick answer
On day 12, expect 6 or more wet diapers and 3–4 or more poops (yellow). Most newborns feed 8–12 or more times in 24 hours, and formula-fed babies take about 2–3 oz (60–90 ml) per feed. Early growth-spurt signs, like extra evening feeds, can start late in week 2. Every baby is different, so watch diapers and cues.
- Wet diapers
- 6 or more
- Poops
- 3–4 or more
- Feeds / 24h
- 8–12 or more
On this page
What's normal on day 12?
| What to expect | |
|---|---|
| Wet diapers | 6 or more |
| Poops | 3–4 or more (formula-fed: at least 1) |
| Poop color | Yellow and seedy (breastfed); tan to yellow (formula) |
| Feeds in 24 hours | 8–12 or more |
| Breast milk per feed | Often 2–3 oz (60–90 ml) if given by bottle |
| Formula per feed | About 2–3 oz (60–90 ml) |
| Milk | Moving toward mature milk |
| Weight | Gaining; back to birth weight for many |
How much does a 12-day-old eat?
Some babies show early growth-spurt signs late in week 2: more feeds, shorter gaps and more fussiness in the evening.
For breastfed babies, extra feeds during a spurt are how supply catches up. They usually ease after a few days.
How many diapers should a 12-day-old have?
6 or more wet diapers. Disposables can make it hard to tell: compare with a clean diaper that has a few tablespoons of water poured in, so you know what properly wet feels like.
See every day side by side in wet diapers by day and the baby poop color guide.
What else is normal on day 12?
- A rough routine may be forming. Treat it as a loose shape for the day, not a rule.
What happens on day 13?
Day 13 brings you to the end of week 2.
Read next: Newborn day 13
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 the day of life (see the table above), or dark yellow urine.
- No meconium (black, sticky poop) in the first 48 hours, or still black or dark green poop on day 5.
- Pink or brick-red staining in the diaper that keeps showing up after the first few days, or blood in the urine.
- Not back to birth weight by about 2 weeks, or your baby seems hungry after nearly every feed.
- Breastfeeding parent: milk hasn't come in by day 5, or breasts stay hard and full after feeds.
- Very sleepy and hard to wake for feeds, floppy, or unusually quiet.
- 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 can I tell if a disposable diaper is wet?
Modern diapers absorb a lot. Compare its weight with a dry diaper, or pour a few tablespoons of water into a clean one to feel what wet is like. Many diapers also have a wetness line that changes color.
Is my 12-day-old going through a growth spurt?
Possibly. USDA WIC lists 2 to 3 weeks as a common growth-spurt time. Expect more frequent feeds for a few days. Plenty of wet diapers means it's going fine.
How many wet diapers should a 12-day-old have?
Expect 6 or more wet diapers in 24 hours on day 12, plus 3–4 or more poops that are yellow. Fewer wet diapers than that, or dark urine, is a reason to call your pediatrician.
Related guides
- How many wet diapers should a newborn have?Newborn wet and dirty diapers by day, from day 1 to week 2: how many to expect, poop color changes, and when fewer diapers mean it's time to call.
- Baby poop color guide: what's normal and what's notA baby poop color chart: meconium, transitional green, mustard yellow, formula tan, plus the colors (red, black, white) that mean call your pediatrician.
- 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.
- How much should a 2-week-old eat?How much a 2-week-old eats: 2–3 oz (60–90 ml) per feed, 8–10 times a day. Daily totals, a sample schedule, hunger cues and when to call the doctor.
- How to track baby feeding and diapersWhy pediatricians ask about feeds and diapers, exactly what to log for breast, bottle and combo feeding, and paper vs notes app vs tracking app compared.
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
- NHS: Breastfeeding: milk supply
- AAP · HealthyChildren.org: How to Tell if Your Breastfed Baby is Getting Enough Milk
- AAP · HealthyChildren.org: Fever and Your Baby
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.