One-month-old babies spit up frequently may be caused by improper feeding methods, meningitis, pneumonia and other factors. 1. Improper feeding methods: Due to the small stomach capacity of children, and the horizontal position, feeding too fast or improper posture after feeding may lead to frequent spitting up of the baby, belonging to the physiological factors, eliminating the above triggers, can be gradually relieved. 2. Meningitis: may be related to bacterial or viral infection, due to the presence of infection, will make the baby spit up frequently, may also be accompanied by fever, nausea, feeding difficulties, diarrhea and other symptoms. 3. Pneumonia: usually associated with pathogenic bacterial infections, can make the lungs infected, after the baby to eat milk will frequently spit up, may also be accompanied by coughing phlegm, fever, dyspnea and other symptoms. The baby’s spitting up frequently may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.