Newborns usually sleep 16 to 17 hours a day, but that’s often only for a couple of hours at a time. Many babies wake up every two to four hours, no matter the time of day. It’s important to ensure your baby is sleeping safely. Remember the ABC’s of sleep — alone, on the back, and in a crib. A-Alone, B-Back, C-Crib. We know it’s hard to resist that snuggle in bed, but following the ABC’s of safe sleep is very important for a healthy baby.