When the baby comes from the mother to a relatively unfamiliar environment, he or she will feel uncomfortable with the sudden changes in the environment, such as the sudden appearance of some sounds or things that may be beyond the baby’s ability to accept, and then the baby is easily frightened, crying, and not easy to soothe. Babies are often frightened by loud noises after falling asleep, noisy sleeping environment, or seeing strangers or fierce animals for the first time. What are the signs of a frightened baby? Sometimes babies suddenly appear emotionally unstable, somehow crying and crying, and sleep restlessly. Sometimes the little arms and legs keep moving in their sleep. These may be frightened. If a baby is frightened during sleep, his eyes will blink constantly, his eyeballs will turn frequently, his hands will be squeezed tightly, or his hands will move constantly, the veins on his forehead will be exposed, sometimes he will wake up suddenly, have insomnia and dreaminess, sleep restlessly at night, cry loudly, and have difficulty in calming down. If the baby is frightened during the day, he may not suck, lose his appetite, be depressed or excited. These are related to the immaturity of the baby’s nervous system development and over-sensitivity to external stimuli. When the baby slowly grows up, the nervous system development is perfect, the above symptoms will slowly reduce or disappear. Parents do not have to worry too much about the baby, when the baby is frightened, try to soothe and stabilize the baby’s emotions.