Three-month-old babies spit up like a fountain because of physiologic gastroesophageal reflux, intestinal diseases, central nervous system disorders and so on. 1. Physiological gastroesophageal reflux: If you overfeed your baby, it may cause your baby to experience physiological gastroesophageal reflux, resulting in the symptom of spitting up like a fountain. Parents need to pay attention to feeding their babies small amounts and multiple meals as much as possible. 2. Intestinal diseases: when the baby has intestinal obstruction, intestinal torsion, congenital pyloric hypertrophy, infection with pathogenic bacteria and other intestinal diseases, may cause the baby to spit up like a fountain phenomenon. 3. central nervous system diseases: when the baby has intracranial hemorrhage, intracranial infection and other central nervous system diseases, the baby’s intracranial pressure is more likely to increase the situation, so that the baby spit up like a fountain phenomenon. Three-month-old babies spit up like a fountain may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.