Infants are easy to scare the reasons mainly include the following: 1, the nervous system is not mature, because the age is relatively small, the nervous system is very delicate, after suddenly hearing a large loud noise will often be frightened, which is manifested in the hands of the jumping as well as crying and restlessness; 2, due to the bile qi deficiency caused by the congenital bile qi deficiency, is often easy to be frightened, can be applied to warm the gallbladder soup to alleviate the situation; 3, due to vitamin D deficiency rickets caused by the vitamin D deficiency rickets will often lead to increased neural sensitivity, and thus easy to be frightened.