Sahih Muslim , Book 2, Hadith 561 (USC-MSA) ⓘ
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.
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 .
also referenced under: Book 2, Hadith 129 (In-Book) & Hadith 286 (Reference)