Umm Fadl bint Harith reported,

I came to the Prophet ﷺ and said, "I saw in a dream, in my house, or my room, one of your limbs."He said, "Fatimah, Allah willing, will give birth to a boy, and you will nurse him."So Fatimah gave birth to Hasan, and she handed him over to me, and I nursed him with the milk of my son Qutham. One day I brought him to the Prophet ﷺ to visit him, and the Prophet ﷺ took him and placed him on his chest. The boy then urinated on his chest, and the urine soaked his lower garment. I struck his shoulders with my hand.He said, "You have hurt my son, may Allah set you right," or he said, "may Allah have mercy on you."I said, "Give me your garment so I may wash it."He said, "The urine of a Jariya is to be washed, but the urine of a boy is only to be sprinkled with water."

عن أم الفضل قالت

أتيت النبي ﷺ، فقلت: إني رأيت في منامي في بيتي- أو حجرتي- عضوا من أعضائك، قال: تلد فاطمة إن شاء الله غلاما، فتكفلينه فولدت فاطمة حسنا، فدفعته إليها، فأرضعته بلبن قثم. وأتيت به النبي ﷺ يوما أزوره، فأخذه النبي ﷺ فوضعه على صدره، فبال على صدره فأصاب البول إزاره، فزخخت بيدي على كتفيه، فقال: أوجعت ابني أصلحك الله أو قال: رحمك الله فقلت: أعطني إزارك أغسله، فقال: إنما يغسل بول الجارية، ويصب على بول الغلام.