Sayyiduna Ali (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Sprinkle water over the urine of a boy, and wash the urine of a girl." Imam Qatadah (may Allah have mercy on him) said: This distinction remains until they start eating food; when they begin to eat food, then the urine of both will be washed.