Sayyidah Umm al-Fadl (may Allah be pleased with her) came to the Prophet (peace and blessings be upon him), and the narrator mentioned a story, in which the Prophet (peace and blessings be upon him) said: "The urine of a baby girl should be washed, and the urine of a baby boy should be sprinkled."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4155