Newborn Feeding Guide: The First 4 Weeks

The first month of feeding is a learning curve for both you and your baby. Whether breastfeeding, formula feeding, or a combination, this guide covers what to expect, how to know your baby is getting enough, and when to get help.

Content reviewed against published AAP, WHO, CDC guidelines

Editorial policy

Last reviewed: July 2026

Key takeaways

Feed your newborn 8-12 times per day (every 2-3 hours), on demand, including overnight.
Your baby's stomach is tiny: marble-sized on day 1, walnut-sized by day 3, egg-sized by day 10.
Track wet diapers to confirm adequate intake: aim for 6+ wet diapers per day by day 5.
Cluster feeding (frequent feeds for hours at a time) is normal and does not mean low supply.
Wake your newborn to feed if they sleep more than 4 hours in the first 2 weeks.

Your newborn's stomach size

Understanding how tiny your baby's stomach is helps explain why they eat so frequently - and why small amounts are perfectly normal in the early days.

Day 1

Size of a cherry (5-7 ml / 1 tsp)

Day 3

Size of a walnut (22-27 ml / 0.75-1 oz)

Day 7

Size of an apricot (45-60 ml / 1.5-2 oz)

Day 30

Size of an egg (80-150 ml / 2.5-5 oz)

Recognizing hunger and fullness cues

Early hunger cues (feed now)

Rooting (turning head, opening mouth)
Sucking on hands or fingers
Lip smacking or licking
Alertness and increased movement

Late hunger cue (try to feed before this)

Crying - this is a late hunger cue. A crying baby may need to be calmed before latching

Fullness cues (stop feeding)

Slowing or stopping sucking
Turning away from breast or bottle
Relaxed hands (unclenching fists)
Falling asleep at the breast/bottle

The first week: Day by day

Day 1

Colostrum (thick, yellow) is all baby needs. Expect 1-2 wet diapers. Baby may be very sleepy after birth. Feed at least 8 times.

Day 2-3

Baby becomes more alert and hungry. Expect more frequent nursing. 3-4 wet diapers per day. Stools transition from dark meconium to greenish. Milk begins to transition from colostrum.

Day 3-5

Milk "comes in" for breastfeeding mothers (breasts become fuller). Baby may cluster feed intensely. 4-6 wet diapers. Stools becoming yellow and seedy. Some weight loss is normal (up to 7-10% of birth weight).

Day 5-7

Feeding should be more established. 6+ wet diapers per day. 3-4+ yellow seedy stools per day. Weight loss should stop and gain should begin. First pediatrician check-up typically happens around days 3-5.

Tracking intake: The diaper count

Since you cannot measure how much a breastfed baby is drinking, diaper output is the best indicator that baby is getting enough.

Age	Wet Diapers	Stools
Day 1	1-2	1-2 (black meconium)
Day 2	2-3	1-2 (dark green/brown)
Day 3-4	3-4	3+ (transitioning to yellow)
Day 5+	6+	3-4+ (yellow, seedy)

Cluster feeding: What to expect

Cluster feeding is when your baby wants to feed very frequently (sometimes every 30-60 minutes) for several hours, typically in the evenings. This is completely normal and does not mean you do not have enough milk.

Most common in the first 6 weeks
Often happens during growth spurts (2-3 weeks, 6 weeks)
Helps build and regulate milk supply
Often followed by a longer sleep stretch
Get comfortable, have water and snacks ready, and let baby feed

When to contact your pediatrician

Baby has lost more than 10% of birth weight
Fewer than 6 wet diapers per day after day 5
No stool for more than 24 hours in the first month
Baby is excessively sleepy and difficult to wake for feeds
Baby is always fussy and never seems satisfied after feeding
Signs of dehydration: dry mouth, sunken fontanelle, no tears
Breastfeeding is persistently painful after the first week
Yellow skin (jaundice) that is not improving

Frequently asked questions

How often should a newborn eat?

Newborns should eat 8-12 times per day (about every 2-3 hours), including overnight. Feed on demand - whenever baby shows hunger cues like rooting, sucking hands, or fussiness. In the first 2 weeks, never let a newborn go more than 4 hours without eating, even if you need to wake them.

How do I know my newborn is getting enough milk?

Key signs your baby is getting enough: 6+ wet diapers per day by day 5, 3-4 yellow seedy stools per day (breastfed) by day 4, baby is content after feeds (not always crying to eat), weight loss of no more than 7-10% in the first week, and regaining birth weight by 10-14 days. Your pediatrician will track weight at check-ups.

Should I wake my newborn to feed?

Yes, in the first 2 weeks, wake your baby if they sleep more than 4 hours between feeds (3 hours if not yet back to birth weight). After baby has regained birth weight and is gaining well, you can generally let them sleep longer stretches at night. Always feed on demand during the day.

What is cluster feeding and is it normal?

Cluster feeding is when a baby wants to feed very frequently (sometimes every 30-60 minutes) for several hours, usually in the evening. It is completely normal, especially in the first 6 weeks. It helps build milk supply and is often associated with growth spurts. It does not mean you do not have enough milk.

How much formula should a newborn drink?

Day 1-2: 0.5-1 oz (15-30 ml) per feed. Day 3-4: 1-2 oz (30-60 ml) per feed. Week 1-2: 2-3 oz (60-90 ml) per feed. Week 3-4: 3-4 oz (90-120 ml) per feed. Feed every 2-3 hours (8-12 times per day). These are averages - follow your baby's hunger and fullness cues.

Bottom line

In the first 4 weeks, feed your newborn 8-12 times per day on demand. Watch for hunger cues, track wet diapers to confirm adequate intake (6+ per day by day 5), and do not worry about strict schedules. Cluster feeding is normal. If your baby regains birth weight by 2 weeks and has plenty of wet diapers, they are getting enough. You are doing great.

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.

All content follows our editorial policy and is reviewed against published clinical guidelines.

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