It can be very stressful for a parent who doesn’t know what to do when their baby cries. But there is always a solution to helping your baby sleep through the night. While newborns sleep 16+ hours a day, babies of 3-4 months sleep in the course of 5 hours. You can start by having your baby sleep in your room in its crib, following a consistent bedtime routine. This way, you may get to fit in those extra 2 hours of sleep that you missed.