Babies sleep too late may lead to a decline in body immunity, easy to catch a cold and fever, in addition is not conducive to the development of the baby’s height, the specific analysis is as follows: 1. Decrease in immunity: If the baby usually sleeps too late, it may lead to a decline in body immunity, it is easy to be infected by bacteria or viruses, fever, cold and so on. 2. Impact on height development: around ten o’clock at night the baby growth hormone secretion will reach its peak, if the baby usually sleeps too late, it may lead to insufficient secretion of growth hormone in the body, affecting the development of the baby’s height. The baby sleeps too late there may be other aspects of the impact, it is recommended that the baby to develop the habit of going to bed early and waking up early to avoid sleeping late.