Ali bin Abi Talib (may Allah be pleased with him) narrated that :
the Messenger of Allah said, about urine of a male child that suckles: "The urine of the boy is sprinkled, and the girl's urine is washed." Qatadah (one of the narrators) said: "This is so, as long as they do not eat, when they eat, then both of them are washed."
Reference: Jami` at-Tirmidhi 610 In-book : Book 6, Hadith 67 English translation : Vol. 2, Book 1, Hadith 610
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