The Book of Purification
2/31. Chapter:
The ruling on the urine of a nursing infant and how to wash it
Sahih Muslim
وَحَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا جَرِيرٌ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتْ أُتِيَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِصَبِيٍّ يَرْضَعُ فَبَالَ فِي حِجْرِهِ فَدَعَا بِمَاءٍ فَصَبَّهُ عَلَيْهِ .
A'isha reported: A suckling babe was brought to the Messenger of Allah (way peace be upon him) and he urinated in his tap. He (the Holy Prophet) sent for water and poured it over.
Reference : Sahih Muslim 286bIn-book reference : Book 2, Hadith 129USC-MSA web (English) reference : Book 2, Hadith 561