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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.
Nighttime Slumber. Babies who are 9 months old are usually able to sleep about 10 hours a night, according to the U.S. Department of Health and Human Services. Your baby should be experienced in putting himself back to sleep when he wakes up in the middle of the night.our 9-month-old should be getting about 13 hours of sleep per day.