Usually a small amount of fluid in the abdominal cavity of a child does not matter and is normal. If the fluid in the abdominal cavity is more than 200ml, then it is important, may be due to hypoproteinemia, viral hepatitis and other diseases. 1. Usually, a small amount of fluid in the child’s abdominal cavity is a normal situation, so it does not matter, the amount of general abdominal fluid is less than 200 ml, a small amount of abdominal fluid for the intestinal tract, can play a certain lubrication, so do not have to worry about too much. 2. If the amount of fluid in the abdominal cavity of a child exceeds 200 ml, then it is an abnormal situation, and we need to consider that it may be caused by pathological factors. It is generally considered that it may be due to long-term improper diet, resulting in malnutrition, resulting in hypoproteinemia. In addition, it can also be seen in viral hepatitis, chronic congestive right heart failure and other diseases. In conclusion, a small amount of fluid in the abdominal cavity of a child needs to be further examined to determine the specific cause, in order to clarify whether it is normal or not.