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The Prophet (sallAllahu alayhi wa salam), “Water should be sprinkled over the urine of a boy, and the urine of a girl should be washed, when the two types of water (urine) are the same. He said, “That is because the urine of the boy is of water and clay, but the urine of the girl is of flesh and blood.” Then he said to me: “Did you understand?” I said: “No.” He said: “When Allah the Most High created Adam, He created Eve (Hawwa) from his short rib, so the boy’s urine is from water and clay, and the girl’s urine is from flesh and blood.” Then he said to me: “Did you understand?” I said: “Yes.” He said: “May Allah cause you benefit from this.”
Ibn majah, authenticated by Albani
The Difference between the Urine of a Baby Boy and a Baby Girl