My Milk Hasn't Come In Yet: Why It Can Be Delayed

When milk usually comes in

The Australian Breastfeeding Association gives the window most people fall into: a sudden boost in milk somewhere between two and five days after birth, with breasts becoming larger and the milk changing to a thin, bluish-white colour. The American Academy of Pediatrics describes the same transition as the onset of transitional milk, produced from about two to five days after birth until ten to fourteen days.

How it feels varies enormously. The ABA notes that for some people it is sudden and dramatic, and for others a gradual change that is hardly noticeable. Not feeling anything is not the same as nothing happening.

Before it comes in, you are not empty

Colostrum is present from before birth and is what your baby is designed to have in the first days. It is small in volume by design — a newborn's stomach is tiny, and the HSE gives expected feed amounts of a few drops to about 5ml on day one, rising to 15–30ml at a feed by day three. Small amounts are correct, not a shortfall.

Why it can take longer

Delayed secretory activation — milk taking longer than about 72 hours to increase in volume — is common and is almost always about circumstances rather than effort. The ABA and La Leche League GB between them list:

• A first baby. Genuinely a risk factor, and one nobody can do anything about.
• A long, exhausting or traumatic birth.
• Caesarean birth, particularly an unplanned one.
• Separation from your baby after birth, or pain and complications that make frequent feeding difficult.
• Retained placenta. Placental fragments left behind keep progesterone high, which blocks milk production. This is treatable, and milk often increases once it is resolved.
• Heavy blood loss after birth. Significant postpartum haemorrhage can delay or reduce milk production.
• Diabetes, including gestational diabetes, and thyroid disease.
• PCOS.
• Large amounts of intravenous fluid in labour, which causes swelling that can make latching harder and can confuse weight measurements.

La Leche League GB adds a point worth repeating because it is so often got wrong: it is not clear that a higher BMI is by itself a problem for breastfeeding, and many people with a high BMI breastfeed easily. What is known is that some conditions associated with it, such as diabetes and metabolic syndrome, can delay milk coming in.

What to do while you wait

La Leche League GB's "3 Keeps" is the clearest framework for a difficult start, because it puts the tasks in order of urgency: keep your milk flowing, keep your baby fed, keep your baby close.

• Remove milk often. At least eight to twelve times in 24 hours, including at night. If your baby is not feeding effectively, hand express and pump. Hand expression is often more productive than a pump in the first days.
• Skin-to-skin as much as possible. It raises the hormones involved and makes it easier to catch feeding cues.
• Get the latch checked in person. The most common reason a baby is not removing milk is that they do not have a deep enough mouthful. This is not something to diagnose from a website.
• Feed the baby. If supplements are needed, giving them does not end breastfeeding. Expressed milk first, then donor milk where available, then formula. Keep expressing alongside, because the supplement replaces a removal unless you do.
• Watch nappies and weight. They tell you what is happening more reliably than how your breasts feel.

Things that need medical review, not more effort

Speak to your midwife, GP or public health nurse promptly if:

• Your milk has not increased by around day five.
• Your baby has lost more than about 10% of their birth weight, or has not started gaining by day four or five.
• You had heavy bleeding after birth, or you are still passing clots or bleeding heavily.
• You have symptoms of thyroid disease, or a known thyroid or diabetes diagnosis.
• Your baby is very sleepy, jaundiced or hard to rouse for feeds.

Retained placenta and thyroid problems are treatable causes, and identifying them changes what happens next. This is a reason to ask early rather than to persevere quietly.

If it never fully comes in

For a small number of people, milk production does not reach a full supply despite everything being done right. La Leche League GB names the situations where that is more likely: a history of infertility from hormonal imbalance, previous breast surgery, insufficient glandular tissue, very large blood loss, PCOS and thyroid problems.

If that is you, the important thing to hear is that this is a physiological situation, not a consequence of not trying hard enough. Partial breastfeeding is a real and valuable outcome — every feed counts, and there is no threshold below which it stops being worth it. Many people in this situation feed at the breast with a supplementer, or breastfeed and give formula alongside. Skilled support from an IBCLC lactation consultant or an infant feeding team helps you find the version that works, and being told honestly what is happening is usually kinder than being told to keep trying without explanation.

What the first days should look like at the other end

Because milk volumes are so hard to judge, output is the more useful measure. In the first day or two, expect one or two wet nappies and dark, sticky meconium. By day three to four, stools should be changing to greenish-brown, and wet nappies increasing. From about day five, expect at least six heavy wet nappies in 24 hours and soft yellow stools. Fewer wet nappies than expected, or continued meconium at day five, is a reason to ask for help that day.

Hand expression is worth learning first

In the first days, hand expression usually gets more colostrum than a pump does, because the volumes are so small that they can be lost in the tubing and flange. Ask a midwife to show you before you leave hospital, and collect what you get in a syringe or spoon so nothing is wasted. Every millilitre in those days is worth having.