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When Does Breast Milk Come In After Delivery?

Baby Care

Written by - Kanchan RaneLast updated: Jul 29, 2026

11 min

Quick Answer

For most mothers, breast milk "comes in", meaning the change from small amounts of colostrum to a larger, fuller milk supply, around day 2 to 4 after delivery, most often by day 3 (NCBI). This surge is called lactogenesis II, and you will usually notice your breasts feeling fuller, firmer and heavier. After a C-section, it is common for milk to come in a little later, often closer to day 4 to 6, because surgery, hormones and some medications can slow the signal (NCBI). Until your milk comes in, colostrum is exactly what your newborn needs. If your milk feels slow, the most effective thing you can do is feed or express often, ideally 10 to 12 times in 24 hours, and hold your baby skin-to-skin, both of which help your milk arrive (La Leche League). If there are no signs by around day 5, ask your doctor or a lactation consultant for help.

Author: Mylo Editorial Team, Mylo Parenting Desk
Medically reviewed by: Mylo Editorial Board, aligned with WHO, NHS and NIH guidance
Last updated: 29 July 2026

Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. If your baby is feeding poorly, losing too much weight, having very few wet nappies, or your milk shows no sign of coming in by around day 5, please contact your doctor, midwife or a lactation consultant promptly.

Key Takeaways

Milk usually comes in around day 2 to 4, most often by day 3 (NCBI).
Before that, your baby lives on colostrum, which is small in volume but exactly right.
The "coming in" surge is called lactogenesis II, and breasts feel fuller and heavier.
After a C-section, milk often comes in a bit later, closer to day 4 to 6 (NCBI).
Delayed milk (after 72 hours) is common and does not mean you have failed.
The best ways to bring milk in are frequent feeding or pumping and skin-to-skin (La Leche League).
Get help if there are no signs by around day 5, or if your baby is feeding poorly.

Milk Coming In: The Typical Timeline

Time after birth	What is happening
Day 1 (first 24 hours)	Colostrum only, in small amounts that suit a newborn's tiny stomach
Day 2 to 4	Milk "comes in" for most mothers; breasts feel fuller and heavier
Day 4 to 6	Common window for milk coming in after a C-section
After 72 hours (past day 3)	Classed as delayed onset; common and often resolves with frequent feeding
Around 2 weeks	Supply settles into mature milk

What "Milk Coming In" Actually Means

Your body starts making colostrum during pregnancy, so you already have milk at birth, just in very small, concentrated amounts. "Milk coming in" does not mean milk appears from nothing; it means production ramps up sharply from that colostrum to a much larger volume of transitional milk. This copious milk stage is called lactogenesis II, and it is triggered by hormonal changes after the placenta is delivered, helped along by your baby feeding (NCBI).

So the first couple of days are not a sign of low supply. They are simply the colostrum phase doing its job while the bigger supply gets ready.

Signs Your Milk Is Coming In

Your breasts feel fuller, firmer, heavier or warmer.
You may feel some tightness or mild engorgement.
Your baby's swallowing becomes more obvious during feeds.
You notice more wet and dirty nappies as intake increases.
Milk may start to leak between or during feeds.

Does Milk Come In Later After a C-Section?

Often, yes. Research shows that after a C-section, milk commonly comes in a little later than after a vaginal birth, frequently around day 4 to 6, and delayed onset is more likely (NCBI). There are a few reasons for this:

The physical stress of surgery and recovery can affect hormonal signals.
Medications and fluids used during and after the operation may play a role.
Pain, tiredness and limited mobility can make early, frequent feeding harder to start.

The good news is that delivery mode matters less when feeding starts early and often. Beginning breastfeeding soon after birth, using skin-to-skin contact, and feeding or pumping frequently all help bring your milk in, whatever the birth route (La Leche League).

Why Milk Can Be Slow to Come In

Delayed onset of lactogenesis II simply means milk comes in after about 72 hours. It is common, affecting a large share of mothers, and it is usually temporary. Recognised factors that can delay it include (NCBI):

Having your first baby.
C-section or a long, difficult labour.
Gestational diabetes, higher body weight, or thyroid or PCOS-related issues.
Significant blood loss or retained placenta.
Stress, exhaustion, or long separation from your baby after birth.

Having one of these does not mean your milk will not come in; it just means it may take a little longer and that early, frequent milk removal matters even more.

What to Do If Your Milk Is Slow

Step	Why it helps
Feed or express often, 10 to 12 times in 24 hours	Frequent milk removal is the strongest signal to bring milk in (La Leche League)
Start early, ideally within 1 to 2 hours of birth	Early feeding shortens the time to milk coming in
Use skin-to-skin contact often	Stimulates prolactin and oxytocin, which drive milk production and flow
Check the latch with a professional	Ensures milk is actually being removed at each feed
Hand express colostrum	Removes milk and stimulates supply when a newborn feeds weakly
Rest and stay hydrated where you can	Supports recovery and your body's ability to make milk

If your baby is sleepy or not feeding well, gentle waking for feeds and hand expression can keep things moving until your supply builds.

Is My Baby Getting Enough Before Milk Comes In?

Usually yes. A newborn's stomach is tiny in the first days, so the small amounts of colostrum are enough. The reassuring signs are that your baby is feeding frequently, having wet and dirty nappies, and not losing an excessive amount of weight. Some weight loss in the first days is normal; most babies are back to birth weight by around two weeks. Your midwife or doctor will monitor this, so keep your early check-ups.

When to Seek Help

Contact your doctor, midwife or a lactation consultant if:

There are no signs of milk coming in by around day 5.
Your baby is feeding very poorly or is hard to wake for feeds.
Your baby has very few wet nappies or is losing a lot of weight.
You feel severe engorgement, pain or signs of infection.

Getting support early usually solves the problem quickly, so do not wait if you are worried.

A Note on Nutrition and Lactation Support

In the first days, what brings your milk in is hormonal change plus frequent milk removal and skin-to-skin, not any food or supplement. Once your milk is in, keeping up your supply depends on continued frequent feeding, along with being reasonably nourished and rested during a demanding time. Some mothers use traditional lactation blends for extra support alongside a good diet, for example Mylo LactoMama™ Lactation Granules, which use shatavari as the hero ingredient. Treat this as support for supply, not as a way to make milk come in faster, and if your milk is delayed or your baby is not feeding well, prioritise seeing a lactation consultant or doctor.

Myths vs Facts

Myth	Fact
If milk is not in by day 2, I have no milk	Milk typically comes in around day 2 to 4; colostrum is feeding your baby until then (NCBI).
C-section means I cannot breastfeed well	Milk may come in a little later, but early, frequent feeding and skin-to-skin help it along.
Colostrum is not enough for the first days	Small amounts of colostrum match a newborn's tiny stomach and are exactly right.
A supplement will make my milk come in faster	Milk coming in is driven by hormones and milk removal, not by any food or supplement.
Delayed milk means I have failed	Delayed onset is common and usually temporary; frequent feeding and support resolve most cases.

Frequently Asked Questions

When does breast milk come in after delivery?
For most mothers, around day 2 to 4, most often by day 3. Before that, colostrum feeds your baby, and the fuller supply, called lactogenesis II, follows (NCBI).

When does milk come in after a C-section?
It often comes in a little later, commonly around day 4 to 6, because surgery, hormones and medications can slow the signal. Early, frequent feeding and skin-to-skin help it arrive (NCBI).

What are the signs my milk is coming in?
Fuller, firmer, heavier or warmer breasts, more obvious swallowing during feeds, more wet and dirty nappies, and sometimes leaking.

What should I do if my milk is slow to come in?
Feed or express often, around 10 to 12 times in 24 hours, start early, use plenty of skin-to-skin, check the latch, and hand express colostrum. Ask a lactation consultant for help (La Leche League).

Is my baby getting enough before my milk comes in?
Usually yes. A newborn's stomach is tiny, so colostrum is enough. Watch for regular feeds, wet and dirty nappies, and normal weight checks with your midwife or doctor.

When should I worry that my milk has not come in?
If there are no signs by around day 5, your baby is feeding poorly, or has very few wet nappies, contact your doctor or a lactation consultant promptly.

Can stress delay my milk coming in?
Stress and exhaustion can be contributing factors, along with things like a C-section or a first baby. Rest, support and frequent feeding all help.

Does milk come in later with a first baby?
It can. Having your first baby is one of the recognised factors linked to a slightly later onset, which is why early and frequent feeding is especially useful.

References

NIH, StatPearls. Physiology, Lactation. ncbi.nlm.nih.gov
World Health Organization (NCBI Bookshelf). The physiological basis of breastfeeding. ncbi.nlm.nih.gov
NIH (NCBI). Determinants of delayed onset of lactogenesis II among women who delivered via Cesarean section. ncbi.nlm.nih.gov
La Leche League. Cesarean Birth and Breastfeeding. lllc.ca

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