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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.
Newborns should average eight or nine hours of nighttime sleep and eight hours during the day. Two-year-olds should sleep an average of 11 hours at night and two during the day. Children ages 4 to 9 should sleep 10 hours, on average, each night. Pre-teens and teenagers generally require nine or 10 hours nightly.