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For babies over 6 months, the amount of nighttime sleep stayed fairly constant across agesâabout 11 hours on average, with a range of approximately 9-13 hours (Iglowstein et al 2003). Baby sleep requirements are also met by sleeping during the day.
Babies at this age on average need 11 hours of sleep at night and 3 1/2 hours of sleep during the day. At nine months, babies should nap for about an hour and a half in the morning and about 1 1/2 to 2 hours in the afternoon. Most have given up that brief, third late-afternoon nap.