Enteritis refers to clinical manifestations such as increased stool frequency and change in stool properties caused by infectious or non-infectious factors. The possible causes of enteritis in a seven-month-old child include infectious and non-infectious factors, and the common causes are as follows: 1. One of the more common infectious factors is viral infection, which is common in the fall and winter months, when the child will have a large number of watery stools, and needs to be checked for rotavirus and stool routine for further diagnosis. The second type of infectious disease is more common factor is bacterial infection, mostly seen in the summer, generally and unclean diet, food spoilage has a certain relationship. 2, in the non-infectious disease is more common in the weather changes or improper diet, these can cause the child’s stool increased or change in nature, should be given different treatment measures according to the different causes.