A newborn baby is a baby who is born from the time the fetus is delivered from the mother and the umbilical cord is tied until 28 days after birth. Many parents will find that a few days after the birth of a small baby sleep a startled, as if scared, the whole body shakes, both hands also shake violently, sometimes sleep can cry in fear. What is going on here? Newborn baby sleep jumping is a normal physiological phenomenon. Because the baby’s nervous system is not mature, the nerve myelin sheath has not been fully formed, the transmission of information within the nerve is not accurate and sensitive enough, often scattered transmission. After being stimulated by external sounds and collisions, and not as concentrated as adults in the cerebral cortex to locate, but the stimulus at the same time by the brain to control all the nerve fibers, so that the excitement “generalized”, thus causing the movement of arms and legs and shaking. If your baby’s shivering affects sleep, you can wrap it properly so that your baby will not wake up from shivering during sleep. Please reassure new parents that the child’s sleep startle is a normal physiological reaction, with the gradual improvement of the baby’s neurological system, to 3-4 months of age, this protective reaction will gradually disappear.