"Babies need a lot of sleep. When they’re between four and 11 months old, they need 12 to 15 hours a day (nighttime sleep plus naps). And at a certain point, they can get a lot of those hours in consecutively at night. The key is sleep training.
Sleep training when babies are too young doesn't work—it usually takes babies about three to six months to develop the circadian rhythm that they’ll need to want to sleep at night and be awake during the day. But once that happens, babies can sleep nine to 12 hours at night. While each baby reacts a little differently to sleep training and there are varying methods, there are a few key points to keep in mind."
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