The 4-month sleep regression can feel like it comes out of nowhere. One week your baby is sleeping longer stretches, the next they’re waking every hour and naps have fallen apart. In this guide, we’ll look at what’s actually happening with your baby’s sleep and gentle ways you can support them through this stage.

Struggling with bedtime battles? Discover the 5 common reasons your baby fights sleep and simple strategies you can try tonight to help them settle more easily.