It is normal for a 17-month-old baby to sleep 15-16 hours a day. The daily sleep time is different at different ages in childhood, and ensuring sufficient sleep time is especially important for children’s growth and development. In general, it is normal for newborns to sleep 20-22 hours a day, 15-20 hours a day within 1 year of age, 15-16 hours between 1-2 years of age, about 12-14 hours between 2-3 years of age, 11-12 hours between 4-6 years of age, and 9-10 hours between 7 years of age and older, including the sum of daytime naps of 1-2 hours and nighttime sleep, and this value is normal. If the 17-month-old baby sleeps less, accompanied by poor sleep, sweating, easy to startle or less teething, this situation is mostly considered to be the early symptoms of rickets, need to supplement vitamin D, plus a period of time for observation of calcium supplements.