I see this call so often that I decided to write a blog post about it. Almost every baby I see between four and six weeks is dealing with some changes due to their sleep and feeding patterns adjusting.
It looks like this. Feeding was going well, and then somewhere around four weeks your baby starts fighting the breast. They latch, pull off, cry, root again, latch for a minute and pull off again. Evenings turn into hours of fussing, and you start to wonder if your milk is drying up.
Sometimes it's a feeding problem. But very often, when I look closer, the baby is overtired. Nobody told the parents that a four-week-old can only handle about an hour awake before they need to sleep again.
Why it shows up around four weeks
In the first couple of weeks, most babies sleep through almost anything. They feed, they drift off, and they stay asleep while you pass them around.
Then they start to wake up to the world. They're more alert, they look around, they make eye contact, and it's tempting to keep them up and enjoy it. But their ability to stay awake hasn't caught up with their alertness. At this age, most babies need to be back asleep about 60 minutes after they woke up, and that hour includes the feed and the diaper change.
Miss that window and their stress hormones rise. An overtired baby gets wired, not sleepy, and it gets harder for them to settle, including at the breast.
Hungry or tired? The cues overlap
This is where it gets confusing. A lot of the signs we teach as hunger cues are also tired cues:
Fussing and squirming
Rooting and turning toward anything near their face
Sucking on hands or fists
Wanting to suck constantly
So a parent sees rooting, offers the breast (exactly what we tell them to do), and the baby fights it. That's often because what the baby really wants is to suck to sleep, not a full feed.
If your baby fed well within the last hour or so and has been awake close to 60 minutes, tired is the more likely answer, especially when they are rejecting the breast/bottle.
What overtiredness looks like at the breast
An overtired baby often feeds in short, frustrated bursts. They latch and unlatch, arch their back, cry at the breast, or suck for a minute and then pull off screaming. Feeds turn into snacks, and the snacks keep coming.
It's easy to read this as a supply or let-down problem, especially in the evening. But the same baby will often feed beautifully after a good nap.
What to try
Watch the clock, not just the cues. Note when your baby wakes, and start winding down around 45 to 50 minutes later so they're asleep by about the hour mark.
Feed early in the wake window, not right before sleep. A baby who wakes and feeds while still calm usually takes a fuller feed.
Help them get to sleep. At this age that's normal and expected. Feeding to sleep, contact naps, a carrier, rocking, a dim room or white noise are all fair game.
If they're already overtired, focus on calming before feeding. Skin-to-skin, a quiet dark room, gentle motion, then offer the breast once they've settled. Sometimes a sleepy, relaxed baby will latch when an upset one won't.
Give it a few days. Once babies catch up on sleep, feeds often settle down quickly.
When it might be something else
Overtiredness is common, but it's not the only reason a baby fusses at the breast. Get your baby checked if:
They aren't gaining weight well, or wet and dirty diapers have dropped off
Feeding is painful for you
They seem fussy no matter how much they sleep
They have a fever, are vomiting, or seem unwell (call your doctor or midwife right away)
If you're not sure which one you're dealing with, book a consult. Half the time, we figure it out by watching one feed together.
