Sleeping through the night. At some point between 4 and 6 months, most babies are capable of sleeping for several hours at a stretch at night. Once this happens, you'll be able to get through a few sleep cycles and feel more rested in the morning. If your baby isn't yet sleeping through the night, you're not alone. Many babies still wake up more than once at night for feedings in the 4- to 6-month stage. But by 6 months, if not before, your baby's likely to be ready for night weaning, if that's what you choose. Waking up again.