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How do you know if you have delayed onset of lactation?

Copious milk production, which usually occurs by the fifth day after the birth, can't always be measured by a feeling of fullness in the breasts. This is because if your baby is feeding frequently and flexibly, you mightn't experience breast fullness when your milk comes in.

Fullness of the breasts might also signal that you've had an overshoot in milk production beyond what your baby needs, and the fullness is in fact dialing down or calibrating your supply.

But if you're not offering your breast often enough to your baby, the supply may dial down too much and then not meet your baby’s needs.

And you might be a woman who has an underlying medical condition that puts her at increased risk of delayed onset of lactation. You can find out more about this here.

If you don’t have copious milk production by the end of day five, measured by baby’s throughput and baby beginning to gain weight well, we refer to this as delayed secretory activation. There are a number of causes for this, that your health professionals will screen for. You can find a list of possible causes here.

Recommended resources

What happens inside your breasts to make your milk come in

Frequent flexible breastfeeds make life easier, not harder

Your milk ejection reflex: what letdown feels like and how it works

What you need to know about baby weight gain in the first two weeks of life?

Busting myths about your letdown or milk ejection reflex

How small are newborn tummies really, and why do they need to suckle so much?

How can you tell if your baby is getting enough milk from direct breastfeeding?

PBL Advanced

KEY CLINICAL TIPS: Diabetes, Polycystic Ovary Syndrome, delayed onset of secretory activation, and breastfeeding

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