3-year-old baby sleep time is about 10-12 hours or less. With the growth of age, the baby’s sleep time is also changing. 3-year-old baby’s brain has gradually in a perfect state, sleep time is generally more regular, so usually do not need to sleep too much, too much sleep will cause the baby’s head discomfort phenomenon, usually 8-10 hours of sleep at night, and 1-2 hours of sleep at noon can be. The baby’s body development will develop towards the normal trend if the baby doesn’t like to sleep normally, which will lead to shorter stature and poorer thinking ability than their peers. 3 years old children like to play with others and sometimes sleep longer, which is a normal phenomenon. In addition, when the baby sleeps, parents need to create a quiet and comfortable environment for the baby to have a good sleep.