Bringing home your newborn is an incredible, emotional moment — and one often filled with questions about feeding. How much should a newborn eat at 3 days old? Is your baby getting enough, or too little?
If you’re feeling anxious or overwhelmed, you’re not alone. The information in this article is based on guidelines from the American Academy of Pediatrics (AAP).
This guide will walk you through exactly how much breastmilk or formula your 3-day-old needs, what signs to watch for, and how to know your baby is getting enough.
Table of Contents
Understanding Your Newborn’s Tiny Stomach
In the first week of life, a newborn’s stomach grows rapidly — but at 3 days old, it’s still incredibly small. About the size of a walnut. This means they can only take in small amounts at each feeding, but need to feed very frequently.
This is completely normal. It’s not a sign that something is wrong or that you’re not producing enough milk.
Feeding Chart — How Much Should a Newborn Eat at 3 Days Old?
| Baby’s Age | Stomach Size | Per Feeding | Total Per 24 Hours |
|---|---|---|---|
| Day 1 | Cherry (5–7 ml) | 5–7 ml (0.2 oz) | 30–60 ml (1–2 oz) |
| Day 2 | Walnut (10–15 ml) | 10–15 ml (0.5 oz) | 150–180 ml (5–6 oz) |
| Day 3 | Walnut (22–27 ml) | 22–27 ml (0.75–1 oz) | 180–240 ml (6–8 oz) |
| Day 4 | Apricot (30–45 ml) | 30–45 ml (1–1.5 oz) | 240–300 ml (8–10 oz) |
| Day 5–7 | Apricot (45–60 ml) | 45–60 ml (1.5–2 oz) | 300–420 ml (10–14 oz) |
These are averages. Some babies eat a little more, some a little less. Watch your baby’s cues and diaper output — not just the numbers.
How Much Breastmilk Should a 3-Day-Old Eat?
At 3 days old, your milk is transitioning from colostrum — the thick, yellowish “first milk” — to transitional milk. This is a big change for both you and your baby.
Most breastfed babies will feed 8 to 12 times in 24 hours, taking in about 22–27 ml (0.75–1 oz) per feeding. It’s also completely normal for breastfed babies to nurse for comfort as well as nutrition.
What Is Cluster Feeding?
Cluster feeding is when your baby wants to nurse several times close together — often in the evening. This is normal and actually helps stimulate your milk supply.
If your baby wants to nurse again soon after a feeding, that’s their way of telling your body to produce more milk. Go with it.
Practical Breastfeeding Tips
- Check the latch — baby’s mouth should cover more of the areola, not just the nipple
- Burp after every feeding — gently, over your shoulder or sitting upright
- Monitor diapers — by Day 3, expect at least 3–4 wet diapers and 2–3 stools
- Use a nursing pillow — it reduces strain and helps you hold the position longer
When to Get Help With Breastfeeding
- Painful latch, cracked nipples, or ongoing pain — see a lactation consultant
- Baby seems lethargic, won’t wake to feed, or has fewer than 3 wet diapers by Day 3 — call your pediatrician
How Much Formula Should a 3-Day-Old Eat?
Formula-fed newborns at 3 days old usually take about 22–27 ml (0.75–1 oz) per feeding, every 2 to 3 hours. Total daily intake is typically 180–240 ml (6–8 oz).
Practical Formula Feeding Tips
- Feed on demand — don’t force-feed; let your baby guide the pace
- Use slow-flow nipples — this helps babies feed at a natural, safe speed
- Burp halfway through and after — to prevent air swallowing and discomfort
- Keep the bottle tilted — so the nipple stays full of milk, not air
- Watch for hunger cues — rooting, sucking motions, hands in mouth
- Watch for fullness cues — turning away or closing their mouth means they’re done
When to Worry About Formula Feeding
- Vomiting (not just spit-up) after most feedings
- Fewer than 3–4 wet diapers by Day 3
- Persistent refusal to feed or signs of distress
Signs Your 3-Day-Old Is Eating Enough
This is the question every new parent asks. Here’s exactly what to look for:
- Wet diapers — at least 3–4 by Day 3; by Day 5, 6 or more per day
- Bowel movements — at least 2–3 yellowish stools per day
- Steady weight — some weight loss is normal (up to 7–10% of birth weight), but it should stop and reverse by 10–14 days
- Content after feeds — baby seems satisfied and sleeps between feeds
- Active and alert — wakes for feeds and has periods of alertness
- Good latch (breastfed) — baby’s jaw moves rhythmically, you can hear swallowing
If you want to track your baby’s weight gain over time, our baby growth tracker tool lets you log measurements and spot the trend week by week.
How Often Should a 3-Day-Old Newborn Eat?
Most newborns feed every 1.5 to 3 hours, both day and night. Don’t skip nighttime feeds — your baby’s stomach is too small to go long stretches without eating.
- Breastfed babies: 8–12 feedings per 24 hours
- Formula-fed babies: 8–10 feedings per 24 hours
Remember — crying is a late sign of hunger. Look for early cues first: rooting, sucking motions, bringing hands to mouth, or smacking lips. By the time your baby is crying hard, they’re already very hungry and harder to latch.
From Colostrum to Transitional Milk
What Is Colostrum?
Colostrum is the thick, yellowish milk your body produces in the first days after birth. It’s sometimes called “liquid gold” — packed with antibodies, nutrients, and exactly what your newborn needs. Even tiny amounts are enough in those first days.
What Comes Next
By Day 3 to 5, your milk transitions to whiter, more plentiful transitional milk. You’ll likely notice your breasts feel fuller, and your baby may start taking slightly larger, more regular feeds.
This transition is a big moment. Many moms worry their supply is low before this happens — but your body is right on schedule.
Creating a Calm Feeding Environment
The environment matters more than you might think. A calm space helps both you and your baby relax and feed better.
- Soft lighting and quiet background noise
- A comfortable chair with arm support
- A nursing pillow to reduce strain
- Water and a snack nearby — you need nourishment during feeds too
If your baby is extra fussy before or after feeds, our newborn crying at night guide covers common reasons and what actually helps.
Diaper Output — The Easiest Way to Know It’s Working
Diapers are your best real-time indicator that feeding is going well.
| Day | Wet Diapers | Stools |
|---|---|---|
| Day 1 | 1 | 1 (dark meconium) |
| Day 2 | 2 | 2 (dark/greenish) |
| Day 3 | 3–4 | 2–3 (transitioning) |
| Day 5+ | 6+ | 3–4 (yellowish) |
If you’re seeing these numbers, your baby is getting enough. If you’re falling short — especially fewer than 3 wet diapers by Day 3 — call your pediatrician.
When to Call Your Pediatrician
Most feeding concerns in the first days are normal. But contact your doctor right away if:
- Fewer than 3 wet diapers by Day 3, or fewer than 6 by Day 5
- No stools for more than 24 hours
- Baby refuses to feed or vomits persistently
- Signs of dehydration — dry mouth, sunken soft spot, no tears when crying
- Baby is very sleepy or hard to wake for feeds
- Baby hasn’t regained birth weight by two weeks
A good pediatrician will never make you feel silly for calling. When in doubt, pick up the phone.
You’re Doing an Amazing Job
Every newborn is unique, and so is every feeding journey. If you keep wondering “how much should my 3-day-old eat?” — remember that your baby’s cues, diaper output, and contentment matter more than any exact number.
Trust your instincts. Lean on your care team. And know that you’re already doing the hardest and most important part — showing up for every single feed.
You’ve got this. 💛
Frequently Asked Questions
How much should a 3-day-old eat per feeding?
About 22–27 ml (0.75–1 oz) per feeding, whether breastfed or formula-fed. Their stomach is still very small at this stage, so small and frequent is exactly right.
How much does a 3-day-old newborn eat in a day?
Typically 180–240 ml (6–8 oz) over 24 hours, divided into 8–12 feedings. The total adds up even though each feed is small.
How much breastmilk should a baby drink at 3 days old?
Breastfed babies nurse frequently and take in small amounts — about 0.75 to 1 oz per feed. Trust your baby’s cues and diaper output more than exact numbers.
How much formula should a 3-day-old baby eat?
Formula-fed babies usually take 0.75–1 oz per feed, every 2–3 hours. Total daily intake is typically around 6–8 oz at 3 days old.
How much should a newborn eat at 5 days old?
By Day 5, expect 45–60 ml (1.5–2 oz) per feeding. Wet diapers should be 6 or more per day by this point.
What if my 3-day-old is too sleepy to eat?
If your baby is too sleepy to wake for feeds or isn’t producing enough wet diapers, call your pediatrician. Sleepiness combined with poor feeding in a newborn always warrants a check.
Written by S.A., founder of NewbornCry.com. Learn more about me here.
Medical Disclaimer: This article is for educational purposes only and is not a substitute for professional medical advice. Always consult your pediatrician with any concerns about your newborn’s feeding or health.