There are many causes of bubbles in baby urine, both pathologic and non-pathologic. Bubble urine caused by kidney damage is mainly formed by protein leakage, also called proteinuria. Excluding pathological causes, there are many factors that produce bubbles in the urine of normal people. First, urination is too urgent and too high in position. When urination is too urgent or urination is too high, the urine collides with the liquid surface, mixed with air, then it is easy to form foam, but quickly dissipate; second, urine concentration. If you drink too little water or sweat too much, so that the concentration of urine, can lead to an increase in the concentration of protein and other components in the urine, resulting in foamy urine; third, other causes. Such as disinfectants or descaling agents in the toilet, which can cause the urine to form foam.