Drooling in babies is a normal physiological phenomenon. However, excessive drooling may be the result of some ulcers, inflammatory diseases or neurological problems. If a baby has blisters at the corners of the mouth when drooling, it is usually due to mouth ulcers and stomatitis. Babies with mouth ulcers will experience severe pain and have difficulty swallowing and refuse to eat. It is recommended to take the baby to the hospital for treatment in time, and at the same time, the diet is based on soft and rotten liquid food. Drooling, fever, runny nose and other symptoms are generally caused by inflammation of the baby’s tonsils and throat, and also accompanied by throat redness and swelling discomfort and swallowing difficulties, parents are advised to let the baby drink more water to help dissipate the inflammation, and in serious cases go to the hospital for treatment. Drooling along with mouth ulcers may be caused by hand, foot and mouth disease or chicken pox. Drooling while the baby appears some abnormal behavior, such as coma, may be due to the baby neurological disease, common are meningitis sequelae, facial nerve palsy, intellectual disability, etc.. It is important to go to the hospital for examination in time to prevent delaying treatment and aggravating the condition. Although drooling is a normal phenomenon, if drooling is accompanied by other symptoms at the same time to draw attention to it and take timely treatment.