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Is it safe? · Pregnancy Smart

When does your milk come in after birth?

Assigned clinical reviewerSharyn Harrison· CNM, NPDraft · pending clinical reviewUpdated

What does the evidence say about when breast milk comes in after birth during pregnancy?

  1. Colostrum is the early milk available after birth. CDC says the larger-volume, thinner milk usually arrives by about three days, although first-time parents may take longer. 1
  2. A systematic review and meta-analysis also uses onset beyond 72 hours after birth as the definition of delayed onset of lactation. 2
  3. A prospective cohort found delayed lactogenesis II after cesarean birth was more likely with first birth, lower feeding frequency in the first 48 hours, and several maternal factors in that study population. 3
  4. A prospective study found delayed lactogenesis II was more common after unscheduled cesarean birth and when first breast contact occurred two or more hours after birth in that cohort. 4
  5. CDC assesses newborn milk intake through feeding frequency, swallowing, weight, and urine and stool output. Ongoing weight loss after day five, low diaper output, or yellow skin are reasons for prompt assessment. 5

How this changes over time

  • Immediately after birth, colostrum is the early milk available for the newborn. Frequent feeding and skilled support can help establish milk removal.
  • During the first several postpartum days, many parents notice fuller breasts and a larger milk volume as lactogenesis II begins.
  • After the first postpartum week, ongoing feeding concerns should be assessed by the baby’s clinician and a lactation professional rather than judged by breast fullness alone.

Frequently asked questions

When does breast milk usually come in after birth?

Breast milk usually increases noticeably by about three days after birth, although timing varies and first-time parents may take longer. Colostrum is already available before the larger-volume change. Ask for support if milk seems delayed rather than waiting through a feeding concern.

What is lactogenesis II?

Lactogenesis II is the transition to more abundant milk secretion, often described as milk coming in. Parents may notice breast fullness and a larger milk volume.

Is colostrum enough before milk comes in?

Colostrum is the normal early milk for a newborn. Whether a baby is taking in enough should be assessed with feeding observation, weight, and diaper output by the baby’s care team.

What counts as delayed milk coming in?

Delayed lactogenesis II is commonly defined as the onset of more abundant milk secretion more than 72 hours after birth.

Can a cesarean birth delay milk coming in?

Studies have found an association between cesarean birth and delayed lactogenesis II, especially with some obstetric circumstances. A cesarean does not mean a parent cannot breastfeed.

Does having a first baby make milk come in later?

First birth was associated with delayed lactogenesis II in a cesarean-delivery cohort. Individual timing still varies and should be assessed with feeding support, not predicted from one factor.

How do I know if my baby is getting enough milk?

For a newborn, look at breast-milk swallowing, frequent feeding, weight trend, and diaper output together. CDC lists at least six wet diapers a day by day five as one expected sign. Fewer wet diapers, continued weight loss after day five, or yellow skin warrant prompt contact with the baby's clinician.

When should I ask for help with delayed milk coming in?

Get lactation help for delayed milk, painful feeding, or latch difficulty. Contact the baby's clinician right away if you are worried about intake or health, including low diaper output, yellow skin, or continued weight loss after day five. A feeding problem needs assessment regardless of breast fullness.

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References

  1. What to Expect While Breastfeeding

    CDC · https://www.cdc.gov/infant-toddler-nutrition/breastfeeding/what-to-expect-while-breastfeeding.html

  5. Newborn Breastfeeding Basics

    CDC · https://www.cdc.gov/infant-toddler-nutrition/breastfeeding/newborn-basics.html

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.