Children with foamy urine may be suitable for urinating too quickly, urine concentration and other causes, but also may be related to certain diseases such as nephrotic syndrome, diabetes mellitus and so on. 1. Non-disease factors: Urinating too quickly can cause air to mix with the urine and form foam. In the case of drinking less water and sweating more, the urine is concentrated, which will easily lead to the formation of foam. There are disinfectants or descaling agents in the toilet, etc., which can also cause urine foam. 2. Diseases: Kidney diseases (nephrotic syndrome), diabetes, infectious diseases (pyelonephritis, cystitis, glomerulonephritis), oncological diseases (renal tumors) and other diseases, there will be urine foam. Children with foamy urine are advised to go to the hospital to rule out non-disease factors.