The symptoms of Yin deficiency in children can be manifested in the following ways: 1. There are abnormalities in the second stool. Children’s stools are dry and the volume of urine is obviously low. 2. abnormalities of the mouth and lips. Children with Yin deficiency have very dry lips, red lips, red tongue and less tongue coating, and sometimes they feel a dry and itchy throat. 3. Because Yin deficiency will produce internal heat, children will have dry nasal cavity and even mouth ulcers and other symptoms of fire and heat.