Nine months baby cough spit up milk may be pneumonia, gastroesophageal reflux disease and other diseases, more life conditioning and drug treatment. 1. Pneumonia: can also make the baby cough spit up the situation, such as viral infections caused by the general no special treatment drugs; such as bacterial infections caused by the use of penicillin, cephalosporin and other drugs as prescribed anti-infection treatment; such as Mycoplasma pneumoniae infection caused by the use of azithromycin and other drugs for treatment. In addition, supplemental food should be light and easy to digest. 2. Gastroesophageal Reflux Disease (GERD): it can also make babies cough and spit up, daily can raise the head of the bed 30 °, sleep should take the left side of the lying position; to thick diet, a small amount of meals, artificial feeding children can be added to the milk of starchy food or eat cereal; if necessary, follow the doctor’s orders to use omeprazole, thioglycollate aluminum and other medications. All of the above drugs need to be used under the guidance of a doctor, avoid self-medication. There are many other causes of cough and spitting up in babies, and it is recommended to consult a doctor in time to be evaluated and handled by a specialist.