A one-year-old baby who is always picking at his mouth and crying may be associated with oral mucosal lesions, herpetic pharyngitis, foreign bodies in the throat and other factors. 1. Oral mucosal lesions: when the baby occurs oral inflammation, ulcers in the mouth or thrush, resulting in discomfort in the oral mucosa, so there will be crying problems, the need for gums and oral cavity examination. 2. Herpes pharyngitis: Herpes pharyngitis can occur in babies with viral infections, leading to pain in the throat and the problem of one-year-old babies picking at their mouths and crying. 3. pharyngeal foreign body: the presence of foreign bodies in the throat can also lead to this situation, if children eat some food such as jujube skin, adhering to the part of the palatal arch, may also lead to this situation. The problem of one year old babies picking at their mouths and crying, it is recommended to consult the pediatrics department of a regular hospital to find out the cause of the problem.