Babies sobbing like crying during sleep is clinically known as sob-like breathing, and if the baby is not accompanied by other symptoms, the appearance of sob-like breathing during sleep is a normal phenomenon. Because the baby is too small, the respiratory system is still in a tender state, the capacity of the chest cavity is limited, can store less gas, so the breathing will appear to be less stable. Coupled with the development of the nervous system is not perfect, sudden noise is easy to scare the baby’s fragile nerves, there will be a variety of strange performance of the newborn sleep. Then there is the baby dreaming, the small baby for the external stimulus during the day is different strength, in the dream performance of the action will be different.