Babies are always woken up with a startle is usually a normal physiological response, may also be affected by disease, depending on the cause of different treatment methods. It is recommended that parents pay attention to soothe the baby, observe the baby’s reaction, and consult a doctor for examination when there is abnormal crying. The baby’s nervous system is not yet fully developed, the external stimuli will be more sensitive, so when the baby sleeps, heard the sound of the door closing, walking sound, etc., are easy to be awakened, this is a normal startle response, but also the baby’s instinctive self-defense protection. Parents are advised to calm the baby in time, gently pat the baby with the palm of your hand, and he or she will soon be able to fall asleep again. If the baby has an abnormal expression, and there is more than one crying phenomenon, do not rule out that the baby is due to some kind of physical illness and uncomfortable, such as digestive diseases, colds and so on. It is recommended to take your baby to the hospital for examination and treatment under the guidance of the doctor. Usually pay attention to the baby to create a quiet sleep environment, avoid noisy environment.