Surviving the 4-Month Sleep Regression
My baby hit 4 months last week… and just like that, the decent stretches of sleep we had finally started to enjoy disappeared overnight.
Suddenly she’s waking every 45–90 minutes, fighting naps like it’s her full-time job, and treating bedtime like a personal insult.
If this sounds familiar, welcome to the (very real) 4-month sleep regression. I've been googling and it really is a common feature.
What’s actually going on?
Around this age, babies’ sleep cycles mature and start looking more like adult ones. They move through lighter sleep stages more often and often can’t connect those cycles on their own yet. On top of that, they’re suddenly more aware of the world, practicing new skills (rolling, grasping, babbling), and sometimes dealing with growth spurts or teething. Result: more night wakings and shorter naps.
It’s temporary (usually 2–6 weeks), but it can feel endless when you’re living it.