The sleeping time of three-month-old babies is 16 to 18 hours, with some individual differences, but it is normal as long as the mental state is good, the diet is good, and the growth and development are good. At different ages, the 24 hours of sleep a day is not the same. The total sleep time of a newborn baby reaches more than 20 hours a day, 1~3 months for 16~18 hours, 4~6 months for 14~17 hours, after one year old, the daytime sleep time is gradually shortened and the nighttime sleep time is lengthened, and even the whole night sleep. Different age stages as well as different infants, their sleep standards are also different sleep time, just a probability figure, as long as the baby is energetic, normal growth and development can be.