The baby’s stomach bulging hard, may physiological factors, eating method improper, indigestion and so on. 1. physiological factors: due to the baby’s abdominal muscle development is not yet perfect, the abdominal wall is more flaccid, after eating a full stomach by the gastrointestinal contents of the deformation of the baby’s tummy bulging hard phenomenon. 2. Eating method is not appropriate: the baby ate milk powder is more forceful and eat faster, it will swallow a lot of air, causing abdominal distension, thus appearing baby belly big drum, hard performance. 3. indigestion: baby tummy bulging hard hard may be caused by indigestion, due to the amount of milk or meal eat more, causing the burden on the digestive system, resulting in increased gastrointestinal tract gas and caused by the tummy bulging hard hard. The baby’s stomach bulging hard, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause, under the guidance of the doctor to give targeted treatment or treatment.