It was narrated from Umm Qais bin Mihsan that she brought a small son of hers who has not started eating food to the Messenger of Allah ﷺ. The Messenger of Allah ﷺ took him in his lap and he urinated on his garment, so he called for some water and sprinkled it on it, but he did not wash it.  

أَنَّهَا أَتَتْ بِابْنٍ لَهَا صَغِيرٍ لَمْ يَأْكُلِ الطَّعَامَ إِلَى رَسُولِ اللَّهِ ﷺ فَأَجْلَسَهُ رَسُولُ اللَّهِ ﷺ فِي حَجْرِهِ فَبَالَ عَلَى ثَوْبِهِ فَدَعَا بِمَاءٍ فَنَضَحَهُ وَلَمْ يَغْسِلْهُ  

"A small boy was brought to the Messenger of Allah ﷺ and he urinated on him, so he called for water and poured it on the place where the urine was."  

أُتِيَ رَسُولُ اللَّهِ ﷺ بِصَبِيٍّ فَبَالَ عَلَيْهِ فَدَعَا بِمَاءٍ فَأَتْبَعَهُ إِيَّاهُ