Two weeks and nine months baby stomach pain, but all the tests are normal, may be the occurrence of intractable constipation, irritable bowel syndrome and so on. 1. Intractable constipation: usually associated with bad habits, eating habits, such as constipation is more stubborn, dry stools, defecation less often, may cause abdominal pain, through the examination is not easy to diagnose. 2. Irritable bowel syndrome: a common functional bowel disease, abdominal pain or abdominal discomfort as the main symptom, defecation can be improved, often accompanied by a change in bowel habits, the lack of explanation of the symptoms of morphological and biochemical anomalies, so tummy ache, but the tests are normal. Two weeks and nine months baby stomach pain, but all the tests are normal, there may be other reasons, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.