From colostrum in pregnancy to fuller breasts around day 3: what’s normal, what can slow it down, including a C-section, and when to call the doctor.
For most mothers, milk comes in 2 to 5 days after birth, often around day 3. Until then, your breasts make colostrum, a thick, yellowish first milk that comes in small amounts, just right for a newborn’s tiny stomach. You’ll usually notice your milk coming in as fuller, heavier, warmer breasts. Feeding often in the first days helps, and your baby’s diapers and weight tell you how feeding is going.
When does milk come in during pregnancy?
Your breasts start making colostrum around the middle of pregnancy, from about 16 weeks. Some women leak a little in the last months; others don’t, and both are normal. Leaking or not leaking doesn’t predict how much milk you’ll make later. Only express colostrum before birth if your clinician suggests it.
The timeline after birth
| When | What’s happening |
|---|---|
| Days 1–2 | Colostrum. Small amounts, often a teaspoon or less per feed. Your baby may feed very often. |
| Days 2–5 | Milk comes in. Volume rises quickly; breasts feel fuller and milk looks whiter. |
| Up to about 2 weeks | Transitional to mature milk. Fullness settles as supply matches your baby’s needs. |
Milk comes in because your hormones shift once the placenta is delivered. Frequent feeding doesn’t start the process, but it helps your milk come in well and builds supply for the weeks ahead.
Signs your milk is coming in
- Breasts feel fuller, heavier, firmer or warmer
- Leaking between feeds, or milk dripping from the other side while feeding
- Milk changes from yellow to whiter and thinner
- You hear your baby swallow more often
- Your baby seems more content after feeds
- More wet diapers, and stools turning from dark to yellow by about day 4 or 5
Some fullness is normal. If your breasts become hard, painful and swollen, that’s engorgement: feed often, and ask for help if your baby can’t latch. See Breast Engorgement: How to Get Relief.
What can slow it down
Milk sometimes takes a day or two longer to come in. Common reasons include:
- A C-section, especially an unplanned one
- A first baby
- A long or difficult labor, or heavy blood loss
- A retained piece of placenta
- Diabetes, a higher body weight, or high stress
- Time apart from your baby, or infrequent feeds in the first days
A delay doesn’t mean you can’t breastfeed. It does mean your baby’s weight and diapers need closer watching, and early help from a lactation consultant is worth it.
When does milk come in after a C-section?
Usually within the same 2-to-5-day window, though it can take a little longer after surgery. What helps most is the same as after any birth: skin-to-skin contact and feeding as soon as you’re able, then frequent feeds. If you and your baby are separated, ask your nurse for a hospital-grade pump within the first hours. Side-lying and football holds can keep your baby off your incision; see Breastfeeding After a C-Section: Positions That Help. Most pain medicines given after a cesarean are compatible with breastfeeding; ask your care team about yours.
How to help your milk come in
- Feed 8 to 12 times in 24 hours, including at night
- Hold your baby skin to skin as often as you can
- Offer both breasts, and wake a sleepy baby for feeds if your care team advises
- Get the latch checked early if feeding hurts
- Hand express or pump if your baby can’t feed well yet, and give your baby that colostrum
- Follow your baby’s doctor on any supplements your baby needs
Frequent evening feeds in the first weeks are normal; see Cluster Feeding. For more on building supply later, see How to Increase Milk Supply.
When to call the doctor
Call your baby’s doctor promptly if:
- You notice no signs of milk coming in by about day 4 or 5
- Your baby has fewer wet diapers than expected for their age, or still passes dark stools after day 4 or 5
- Your baby looks more yellow, is unusually sleepy or is hard to wake for feeds
- Your baby has lost more weight than your care team expects, or isn’t regaining it by about 2 weeks
Get care for yourself for fever, flu-like aches, or a painful, red, hot area on your breast, which can be mastitis. The CDC newborn breastfeeding guide explains diapers and feeding in the first days, and Signs of Low Milk Supply lists diaper counts by day.
Where Breastfeeding Support fits
The Breastfeeding Support herbal pouch is a sealed external pouch for mothers, worn over the navel, or at the lower back after a cesarean birth, never on or near the incision, with nothing to swallow. It’s a traditional wellness routine to use alongside your feeding plan. It isn’t a treatment for delayed or low milk and doesn’t replace frequent feeding, lactation support or your baby’s checkups. Breastfeeding safety studies haven’t been done, so review the ingredients with your clinician, and keep pouches away from your baby.
Quick answers
How do I know if my milk has come in?
Your breasts feel fuller and heavier, milk looks whiter, and you hear your baby swallow more.
Is it normal for milk to take 5 days to come in?
It can be, especially after a C-section or a first birth. Keep feeding often and have your baby’s weight checked.
Is colostrum enough for my baby?
For most healthy newborns, yes. Their stomach is tiny in the first days. Your baby’s doctor will tell you if your baby needs more.
Will my milk come in if I don’t breastfeed?
Yes. It comes in after birth either way, then slows if milk isn’t removed. For comfort while it does, see engorgement relief when not breastfeeding.
Reviewed October 2026. Author: Qingcai Wang, MD, PhD, developer of the Five Essences external herbal-pouch formulations, with a commercial interest in their sale. General education only; continue your medical and lactation care.
Sources: CDC, Breastfeeding your newborn; NHS, Is my baby getting enough milk?