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Most 9-year-olds do best with 9–12 hours of sleep each night, with 10–11 hours working well for many school-age kids.

A 10-year-old boy usually needs 9–12 hours of nightly sleep, with many doing best around 10–11 hours on a regular, age-friendly schedule.

A typical 4-year-old needs about 10–13 hours of sleep each day, including any daytime naps.

A typical 9-month-old needs about 12 to 16 hours of total sleep in 24 hours, usually around 14 hours split between night sleep and daytime naps.

A typical 5 year old needs 10 to 13 hours of sleep in 24 hours, including any short nap.

Most 2-year-olds sleep 11 to 14 hours in 24 hours, usually with 10–12 hours at night and 1–3 hours of nap time.

One 3-year-old usually needs 10 to 13 hours of total sleep in 24 hours, including naps.

Most 16-month-olds need 11–14 hours of sleep in 24 hours, with about 10–11 hours at night and 2–3 hours split across naps.

A typical 21-month-old needs about 11–14 hours of total sleep in 24 hours, usually 10–12 hours at night plus 1–3 hours of daytime naps.

Most 18-month-olds do well with 11 to 14 hours of total sleep per day, including 10 to 12 hours at night and 2 to 3 hours of naps.