Typical sleep at this age. At 9 months, babies typically sleep about14 hours a day, including a nap several times a day for one to two hours at a time.Ready for sleep training. If your baby hasn't yet settled into a sleep pattern that fits your family life, now might be a good time to try some type of sleep training.ypical sleep at this age. At 9 months, babies typically sleep about14 hours a day, including a nap several times a day for one to two hours at a time. Ready for sleep training.