Mera baby raat me 2 din se uncomfortable rahta h site time karwati badalta rahta rota b hain...samjh nahi aa rha h aisa kyun kr rha hain?

A. The 4-month sleep regression could begin as early as 3-months-old or as late as 5-months-old. It's more about when your baby's sleep cycle starts changing—for most, it's right around the 4-month mark, but it could be a little earlier or a little later.