If children have foam in their urine, the possible causes are as follows: First, the cause of physical factors, children urinate with a greater impulse, or stand at a high place to urinate, and water shock can produce more foam, this foam is mostly caused by physical tension, and can disappear soon after it is produced, without any treatment, and no need to check. Second, chemical factors lead to increased foam, such as the increase of some abnormal components in the urine, such as sugar or containing more bacteria, protein and other cases, the foam produced by the urine will not disappear quickly in a short period of time, it is recommended to go to the hospital for the relevant examination. Such as a routine urine test to find out if there is an increase in the number of white blood cells in the urine, an increase in protein, etc. It is also necessary to perform a urine sugar test to find out if there is any elevated sugar level, etc. It is also necessary to ask the child if there is any facial swelling or frequent or painful urination, etc. It is necessary to further rule out any infection.