Infants always spit up milk is what disease: 1, congenital pyloric hypertrophy or stenosis, mostly in the first half month or so after birth, in each time after eating milk are vomiting, vomiting within half an hour after eating milk, vomiting frequently, the baby poor mental state, poor nutrition, poor weight growth, to promptly go to the hospital, if necessary, surgery. 2, indigestion, vomiting 4-5 times a day, containing milk flap, stool thin yellow containing milk flap, can 3, central nervous system diseases such as septic meningitis, intracranial hemorrhage, etc., accompanied by bulging fontanelle, increased intracranial pressure, depression or restlessness, to promptly go to the hospital, if necessary, cranial CT examination. 4, feeding posture is not correct, in feeding to try to contain more areola, to avoid inhaling too much air caused by vomiting.