Infants are timid and easily frightened, may be caused by insecurity or calcium deficiency, etc. Parents should reassure the infant, and go to the pediatrics department of a regular hospital to check, if necessary, to take calcium supplementation measures. 1. Insecurity: If the baby is timid and easily frightened, accompanied by the phenomenon of crying, may be insecure, parents should comfort the baby, do not leave the baby alone in too quiet space. If the baby feels accompanied by familiar people, he or she will naturally find a sense of security. 2. Calcium deficiency: If the baby lacks calcium, may also be more timid, easy to be frightened, can be appropriate to give the baby supplement vitamin AD drops. You can also give your baby milk powder with high calcium content. If you find that your baby is timid and easily frightened, it is recommended that you go to a regular hospital for testing to determine whether or not calcium deficiency is the cause. Once diagnosed with calcium deficiency, it is necessary to give infants reasonable calcium supplements under the guidance of professional doctors.