How much additional sleep time is normal for children each day??

Patient's question:

No

Doctor's answer:

Generally speaking, infants have the longest sleep time, requiring about 20 hours in a day. Children aged 1-2 years need about 16 hours, those aged 2-4 years need about 14 hours, those aged 4-7 years need about 12 hours, those aged 7-12 years need about 9-11 hours, and those aged 16-20 years need about 8-9 hours.