My Baby Was Sleeping Through the Night and Now Suddenly Wakes Up. What's Happening?

Written by Kate Jacobs, Certified Infant and Toddler Sleep Consultant serving families in the San Francisco Bay Area and nationwide. She’’s helping families go from chronic night wake ups to sleeping through the night in as little as one week

Published July 2026.

If your baby or toddler was sleeping through the night and has suddenly started waking up again, take a breath first. In most cases this is not a problem that needs to be fixed. It is a normal part of development, and how you respond in these first few nights matters more than what caused it in the first place.

Why did my child's sleep suddenly change?

A sudden shift in sleep after a stretch of solid nights is almost always tied to something your child is working through. A growth spurt, a new skill like rolling or walking, teething, a schedule that no longer fits their age, or even a cold can all show up as a night waking. None of these mean your child forgot how to sleep. They mean your child's body or brain is busy, and sleep is the first thing to get bumped.

The tricky part is not the wake up itself. It is what happens next.

Why does responding to every wake up make it worse?

Every child is different, and the right response depends on your child's age, temperament and what's actually going on. But there is one thing that holds true across almost every family I work with. The more attention a wake up gets, whether that attention feels positive or negative, the more that wake up is likely to happen again.

I know that sounds counterintuitive. You are not spoiling your child by comforting them. But think about what you are teaching in that moment. Turning on the light, picking them up, bringing them into your bed or even just sitting and chatting through the wake up all send the same message. It says this is a moment worth waking up for. Kids are smart. If waking up gets them connection, attention or a change of scenery, they will keep doing the thing that gets them that result.

This is not about ignoring your child. It is about being intentional with how much of a moment you make out of something that may not need to be a moment at all.

So what should I actually do?

This is where a cookie cutter answer falls apart, because the right response depends entirely on your child. A sensitive toddler who startles easily needs a different approach than a strong willed 2 year old testing a boundary. A baby going through a developmental leap needs something different than a toddler who has learned that a 2am wake up gets them a snack. This is exactly why I build every sleep plan around the individual child in front of me, not a generic checklist.

That said, there are a few things that hold true no matter the age or temperament.

Don't leave your child to figure it out alone. Kids are wired for connection. They want to feel like part of the family and the community around them, and sleep is no exception. The goal is not to disappear and hope they sort it out on their own. The goal is to be present in a calm, low key way that shows them you are there without turning the wake up into an event.

Model it, let them practice it, and acknowledge the progress. Sleep is a skill like any other. You show your child what calm and settled looks like, you give them room to practice it themselves and you notice out loud when they do it well. That combination builds real confidence, not just compliance for one night.

Most of the time this does not need to be a big deal. If your child was sleeping well and is now waking up, resist the urge to overhaul everything. The more energy and emphasis you put around a wake up, the more likely it becomes a new habit instead of a passing phase. Stay calm, stay boring and give it a little time before you assume something is broken.

When should I actually make a change?

If the wake ups are new, occasional or clearly tied to something like teething or a growth spurt, hold steady with your current routine and keep your response low key. If it has been going on for more than a week or two, is happening multiple times a night or you notice it is tied to a schedule that no longer fits your child's age, that's usually a sign it's time for a closer look.

You know your child best. My job is not to hand you a one size fits all script. It is to help you understand what's actually going on and build a plan that fits the child you actually have.

Ready for a plan built around your child?

If the wake ups have stuck around longer than they should, I'd love to help. Here's how it works: you book a package, I send you an intake form and we get started within 48 hours.