Three-month-old babies drooling especially much, may be a normal physiological phenomenon, but also may be caused by mouth ulcers, pharyngitis, neuromodulation disorders. It is recommended to go to the hospital for examination, in order to clarify the cause of the disease, and then targeted treatment. 1, normal physiological phenomenon: three-month-old baby’s salivary glands are gradually developing, the amount of saliva secretion increases, but due to the shallow bottom of its mouth, unable to swallow the saliva completely, which leads to drooling especially much. In addition, due to attempts to pronounce words, eating hands and other behaviors can also promote the secretion of saliva, causing three-month-old babies drooling particularly heavy. Usually do not need special treatment, with its normal growth and development, the symptoms can improve on their own; 2, mouth ulcers: three months baby mouth ulcers, due to oral mucosa ulcers will cause pain, which will stimulate saliva secretion, resulting in drooling especially. Usually can be self-healing, feed the baby more water, keep the mouth moist, if necessary, can also be used under the guidance of the doctor local rehabilitation of new liquid, usually pay attention to oral hygiene; 3, pharyngitis: often due to viruses such as adenovirus, bacteria such as streptococcal infections caused by the increase in secretion, which caused the three-month-old drooling particularly high phenomenon. Can follow the doctor’s advice to the baby to take amoxicillin granules, daily drink more water. Breastfeeding mothers can eat more vitamin C-rich foods, such as strawberries, kiwi, etc., through breast milk to the baby supplement vitamin C, to promote the recovery of pharyngitis; 4, neuromodulation disorders: due to the three-month-old baby’s nervous system has not yet fully developed, there may be neuromodulation disorders, resulting in the loss of control of salivary secretion, which causes three-month-old babies drooling especially much. Usually recommended first observation, without special treatment, with the growth of the baby, the nervous system is fully developed, drooling symptoms can gradually disappear.