Baby always overflow may be physiological factors, such as swallowing a lot of air, but also may be lactose intolerance, intestinal obstruction and other pathological factors related to the specific analysis as follows: 1. Physiological factors: the baby is always overflow may be due to the process of eating milk swallowed a lot of air, parents also did not timely burp the baby caused by this physiological factors will not lead to the baby to appear other adverse reactions, so do not need special treatment. 2. Lactose intolerance: babies who are lactose intolerant may also experience milk spillage, which will slowly improve after stopping breastfeeding. 3. Intestinal obstruction: Babies with intestinal obstruction may experience the above symptoms, along with nausea, abdominal pain and other adverse symptoms. There may be other reasons why your baby is always overflowing, so we recommend that you go to the hospital in time for a relevant examination to determine the cause of the problem and then actively treat the symptoms.