A few minutes after latching, does your baby cough, choke, or spit up? Do they cry a lot and seem constantly fussy?
It might all be caused by an overactive letdown (sometimes called forceful letdown).
Never heard of this before? You’re in the right place! This guide is part of our special series on overactive letdown. Here, we’re going back to basics: understanding what it is, how it works, and why it can sometimes cause trouble during breastfeeding.
The milk ejection reflex
1. Abracadabra: the milk is here!
Have you ever wondered why milk suddenly starts flowing when your baby begins to nurse?
At first glance, it might look like a purely mechanical action: baby sucks the milk out like a child with a straw.
And yet, it’s not that simple! If baby suddenly unlatches, you might notice something surprising: milk keeps spraying out for several seconds, even without baby’s help!
Try the same thing with a straw if you like: unless you have magical powers that could get you straight into Hogwarts, nothing will happen!
2. The role of oxytocin in milk ejection
The human body is an extraordinary machine: breast milk is produced in small alveoli inside the breast between feeds, and patiently stored until your baby needs it.
Its release is the result of a complex chemical and mechanical process.
Baby’s sucking movements (jaws, lips, tongue) first send electrical impulses to the brain. The brain, realizing baby is feeding, releases two essential hormones for breastfeeding: prolactin and oxytocin.
Picture the alveoli as little sacs wrapped in elastic bands (called myoepithelial cells).
When oxytocin arrives, these “elastics” contract around the alveoli. Compressed, the alveolus pushes the milk it contains into the milk ducts, the small “tubes” located just behind the areola.
You may feel tingling or warmth in your breasts before the milk finally starts to spray out, bringing a rather pleasant sense of relief. This is called the milk ejection reflex (or letdown).
This process usually takes a few minutes: baby first sucks eagerly, and once the milk starts flowing, their suckling becomes slower and more rhythmic. They’re happily enjoying the rewards of their effort.
In theory... because things don’t always go quite so smoothly!
Sometimes your letdown is just too strong for baby, causing plenty of problems.
The overactive letdown
We talk about an overactive or forceful letdown when milk flows too fast and too strongly, making it hard for baby to swallow. Just minutes into the feed, baby may cough, choke, or gulp down air… Nursing is clearly not enjoyable for them — and by extension, not for you either.
But the consequences of a forceful letdown (REF) don’t just stop at a little discomfort during feeds. They can also disrupt your baby’s daily life: fussy nursing sessions, colic, explosive stools… all signs worth paying attention to.
To help you stay on track, we’ve created a special roadmap : it sums up each step of the anti-REF mission and guides you, one stop at a time, toward calmer, happier feeds.
Now that you know what a forceful letdown is, it’s time to find out if you might be affected. Check out our next article for all the signs that can help you determine if you’re dealing with REF.
Want to explore further? Discover all the steps in our special series on overactive letdown: