If your baby was sleeping well and suddenly starts waking frequently at night or struggling with naps, you might be facing the 4-month sleep regression. This phase can be exhausting for parents, but the good news is that it’s a normal developmental milestone—and it won’t last forever!
What Is the 4-Month Sleep Regression?
Around 3 to 5 months of age, babies go through a permanent change in their sleep cycles. Newborn sleep is deep and less structured, but at this stage, babies develop more adult-like sleep patterns, cycling through lighter and deeper sleep stages. As a result, they wake up more easily and may have trouble falling back asleep on their own.
Signs of the 4-Month Sleep Regression
You might notice:
✔ More frequent night wakings (even if your baby was sleeping well before)
✔ Shorter naps or difficulty staying asleep
✔ Increased fussiness due to lack of rest
✔ Trouble falling asleep without extra help (rocking, nursing, etc.)
How to navigate the 4-month sleep regression
1. Create a consistent sleep routine
A predictable bedtime routine helps your baby wind down and signals that sleep is coming. Keep it simple—dim the lights, read a short book, and offer a soothing cuddle.
2. Encourage independent sleep skills
At this stage, babies are capable of learning to self-soothe. Instead of rocking or feeding to sleep every time, try placing your baby in their crib drowsy but awake so they can practice falling asleep on their own.
3. Watch for wake windows
Overtired babies have a harder time falling asleep, while undertired babies resist sleep. At 4 months, wake windows should be around 1.5 to 2.5 hours between naps.
4. Offer extra comfort (without creating sleep crutches)
Your baby may need more reassurance during this phase, and that’s okay! Respond to their needs, but try to avoid introducing new sleep habits (like rocking to sleep) that could become long-term dependencies.
5. Be patient—This will pass!
The 4-month sleep regression is tough, but it’s a sign your baby is growing and developing. With consistency and gentle guidance, your little one will adjust to their new sleep patterns.