You're feeding the baby on one side and the other side just runs. Or you hear a baby crying in the supermarket, not even yours, and suddenly you feel that tingle and see two wet patches coming through your shirt. Maybe you wake at night and your pyjamas are soaked.
And then the one question almost every mother types into a search bar at three in the morning: is this normal? Is this too much? Or should I be worried?
Short answer: in almost every case, leaking is a sign your body is doing exactly what it should. Below you'll read why it happens, what's normal at each stage, how much is actually "too much" or "too little," and the few signs where you do get something checked with a doctor or lactation consultant. Not blanket reassurance, but the full picture, so you know where you stand.
Why do you leak, really? The let-down reflex, briefly explained
Leaking comes from your hormones, and above all from oxytocin. When your breast gets the signal to release milk, tiny muscle cells around your milk glands contract. They squeeze the milk from the glands through the ducts to the nipple. That's the let-down reflex. The milk comes forward whether your baby is feeding or not, and if more arrives than can leave, it runs out.
Your brain doesn't only make that oxytocin when your baby feeds. It also responds to cues it links with feeding. That's why you sometimes leak at moments that seem to have nothing to do with a feed.
The triggers: what sets it off suddenly
Common triggers of a spontaneous let-down:
- Hearing your baby cry (someone else's baby too).
- Thinking about your baby, seeing a photo, or just smelling a sleep sack.
- A warm shower or bath, from the heat on your breasts.
- A full breast that hasn't been emptied for a while, for instance after a skipped feed.
- Feeding on the other side: while your baby feeds on the left, the right often lets down too.
- Touch, arousal or sex, because the same oxytocin plays a part there.
This is all normal and has nothing to do with "doing it wrong." It's your body still fine-tuning the reflex.
Is this normal? What leaking means at each stage
Leaking changes with the stage you're in. What's perfectly ordinary in week one can look very different by month four, and both are right.
In pregnancy: drops of colostrum
Even before the birth, your breasts may leak a little colostrum (the first, concentrated milk). Some women notice this in the second half of pregnancy, for others it starts only shortly before the due date, and plenty of women don't leak at all during pregnancy. All three are normal.
Important, because many pregnant women worry about this: whether or not you leak in pregnancy says nothing about how much milk you'll make later. Not leaking doesn't predict low supply. More on this in Leaking colostrum in pregnancy: is that normal?.
The first weeks: as the milk comes in
Mature milk production usually comes in between day two and six after the birth; engorgement around day three to five. Your breasts then feel very full, tight and sometimes warm. With good, regular emptying, engorgement usually eases within 24 to 48 hours, but it can last longer. If it doesn't improve after a day or two, or you feel fluey, contact your doctor, midwife or a lactation consultant.
In exactly this period most women leak the most, often on both sides at once and at the oddest moments. Early on, your body makes milk "in stock," before it knows exactly how much your baby needs.
One to six months: supply settles
Supply usually settles to the baby between six and twelve weeks (for many women around six weeks; with oversupply or twins it runs towards twelve weeks). Your breasts then often feel softer and make milk only when your baby asks. For many women this means leaking clearly decreases or largely stops.
Note: softer breasts and less leaking do not mean you're making less milk. It usually means your body is well tuned. If you keep holding a lot and spraying well after this period, it could be oversupply, which needs its own approach. Read Oversupply and a strong let-down reflex.
Around weaning and after stopping
When you stop feeding or pumping, supply gradually drops and leaking usually disappears within a few weeks. For some women a little fluid can come from the nipple on and off for weeks, and that can be normal too. If it lasts a long time, comes from one side only, or looks unusual, read the triage section below.
Want the full timeline from week one to after weaning? It's in When does leaking stop? The patterns from week 1 to weaning.
How much is too much? And how much is too little?
This is the question behind the question, and it's exactly here that the internet gives the most contradictory answers.
The honest truth is that the range is enormous and largely normal. One mother loses every drop after six weeks and never leaks again. Another leaks through her shirt at every feed for months. Both are feeding a healthy, growing baby. The amount of milk you leak says little about the amount you make.
- Little or no leaking is not a sign of too little milk. It often means your breasts are well tuned and release milk only when your baby feeds.
- Lots of leaking is usually just a generous let-down, especially in the first months. If it stays very heavy after the first months too, comes with a baby choking on a forceful spray, or a lot of spit-up and cramping, oversupply may play a part.
In other words: the amount itself is almost never the problem. What counts is how your baby grows and feels, and whether the leaking keeps you from your day. For the latter you can do something, and we'll get to that shortly.
When should you be worried?
Leaking itself isn't an alarm signal. But there are a few situations where leaking or nipple discharge can be a sign of something that needs attention. In these cases contact your GP or midwife for a fever, signs of a breast infection, or bleeding that needs assessing. For breastfeeding support, a lactation consultant (IBCLC) or health visitor can help. But if you have a fever or a red, painful breast, your GP or midwife is the first port of call.
The signs to get checked:
- A fever or a fluey, run-down feeling combined with a breast complaint.
- A red, warm, painful patch or hard area in your breast, especially if you feel yourself getting more unwell. This can point to mastitis (breast infection).
- A hard spot or lump that doesn't ease after a feed or after a few days.
- Bloody discharge from the nipple that doesn't clear on its own within a few days, or discharge from one breast only.
- Unusual nipple discharge: one-sided, clear and persistent, or a strange colour or smell, separate from sore or cracked nipples.
- Cracked, bleeding or infected nipples that won't heal.
This doesn't mean something serious is going on straight away. A little blood from cracked nipples, or the rusty-brown colostrum that can appear in the first days after birth (sometimes called "rusty pipe syndrome"), is often harmless and usually clears on its own within five to ten days. But it's the kind of sign you get checked if it persists, is one-sided, or comes with a lump, rather than waving it away. Comfort should never be a reason to leave a medical complaint unattended.
What you can do now
For ordinary, normal leaking you usually don't need to "cure" anything, it eases on its own. But you don't have to let it run your day either. What helps:
- Catch during a feed. While your baby feeds on one side, you can catch the let-down on the other, for instance with a milk collector. Note: letting it run actively for long or extra pumping can drive up your supply. Briefly catching is different from steadily removing extra.
- Gentle counter-pressure at an awkward moment. Feel the let-down coming in a meeting or on the go? Press firmly against your nipples with your forearm or palm for a few seconds. That often interrupts the reflex.
- Keep your skin dry. A wet layer constantly against your nipple can irritate the skin. Change a wet layer in time and go easy on harsh washing.
- Count on the night. For most women leaking is heaviest at night, simply because there's longer between feeds. What to do about it practically is in Night leaks: what to wear in bed without leaking through.
- Know that it's temporary. For most women the heaviest phase is the first six to twelve weeks. After that your body settles.
Staying dry without thinking about it all day
Most solutions come down to a layer of absorption between you and your clothes. Loose pads do that, but they have the familiar drawbacks: they shift, roll up and end up just wrong the moment you need them most.
That's why we built our nursing bra with the absorption built into the cup itself. Four layers, each with one job: a layer that wicks moisture away from your skin, a core that catches up to 30 ml per cup, a barrier that protects your shirt and a soft outer layer. Wireless, with a clip that opens one-handed and knitted from an OEKO-TEX Class I certified fabric (certificate number 11-36224), the strictest category for textiles that touch a baby's skin. Nothing to shift, nothing to think about during the day. For the days you just want to stay dry without thinking about it: see the nursing bra. Unsure of your size in this stage, when your cup is still fluctuating? Read Measuring your nursing bra and finding the right fit first.
Frequently asked questions about leaking
Is it normal to leak more from one breast than the other?
Yes. Almost no woman is exactly equal on both sides. One breast often makes a bit more milk and so leaks more. That difference in itself is normal. Do keep an eye out if only one breast has bloody or unusual discharge that persists or comes with a lump; get that checked by your GP.
Can I leak during pregnancy?
Yes. From the second half of pregnancy your breasts may leak a little colostrum, the first concentrated milk. Some women notice this weeks ahead, others only just before the birth, and plenty of women don't leak at all. All three are normal. Whether or not you leak says nothing about how much milk you'll make later.
Does lots of leaking mean I have lots of milk?
No. The amount you leak says little about the amount you make. Lots of leaking is usually just a generous let-down, especially in the first months. Little or no leaking often means your breasts are well tuned and release milk only when your baby feeds. What counts is how your baby grows and feels.
When should I worry about discharge from my nipple?
Most nipple discharge is harmless. Get it checked if bloody discharge hasn't cleared after a few days, if it comes from one breast only, or if it has a strange smell or colour, separate from cracked nipples. If a fever comes with it, or a red, painful, hard patch, call your GP.
Should I do anything to stop the leaking?
For ordinary leaking you don't need to "cure" anything. It eases on its own once your supply settles, usually after the first six to twelve weeks. If you keep catching milk all day or pumping extra, that can actually prompt your body to make more and leaking increases. Catch it calmly and don't force anything further.
Read on in this guide
This article is the entrance to our whole guide on leaking and the let-down reflex. Go deeper into the part that applies to you now:
- Leaking colostrum in pregnancy: is that normal?
- Night leaks: what to wear in bed without leaking through
- When does leaking stop? Patterns from week 1 to weaning
- Oversupply and a strong let-down reflex
- Measuring your nursing bra and finding the right fit
- Everything about leaking, let-down and staying dry (the overview)
