Newborns who do not cry or sleep may be caused by a lack of nutrients, sleep environment, and disruption of the biological clock. 1. lack of nutrients: lower blood calcium will make the brain, vegetative nerve excitability increase, which leads to the newborn sleep is not stable. 2. Sleep environment: the sleep environment will affect the newborn’s sleep, and generally do not cry, such as too much noise, too bright lights, indoor too dry and other reasons will cause newborn sleep disorders, parents are advised to adjust the environment in a timely manner in order to ensure that the newborn sleep. 3. Biological clock disorders: newborns sleep too much during the day, the night will appear the phenomenon of sleeplessness, it is recommended that parents should not let newborns sleep more during the day, do not get too excited before bedtime, slowly adjusted. Newborns do not cry and do not sleep may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.