Babies were brought to the Messenger of Allah ﷺ and he blessed them, and after having chewed (something, e. g. dates or any other sweet thing) he rubbed there with their soft palates. A baby was brought to him and he passed water over him (over his garment), so he asked water to be brought and sprinkled it, but he did not wash it.  

عَنْ عَائِشَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُؤْتَى بِالصِّبْيَانِ فَيُبَرِّكُ عَلَيْهِمْ وَيُحَنِّكُهُمْ فَأُتِيَ بِصَبِيٍّ فَبَالَ عَلَيْهِ فَدَعَا بِمَاءٍ فَأَتْبَعَهُ بَوْلَهُ وَلَمْ يَغْسِلْهُ  

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.  

أُتِيَ رَسُولُ اللَّهِ ﷺ بِصَبِيٍّ يَرْضَعُ فَبَالَ فِي حِجْرِهِ فَدَعَا بِمَاءٍ فَصَبَّهُ عَلَيْهِ  

Hisham narrated the hadith like one transmitted by Ibn Numair (the above mentioned one) with the same chain of transmitters.  

حَدَّثَنَا هِشَامٌ بِهَذَا الإِسْنَادِ مِثْلَ حَدِيثِ ابْنِ نُمَيْرٍ  

Umm Qais daughter of Mihsan reported that she came to the Messenger of Allah ﷺ with her child. who was not yet weaned, and she placed him in his lap; and he urinated in his (Holy Prophet's) lap. He (the Holy Prophet) did nothing more than spraying water over it.  

أَنَّهَا أَتَتْ رَسُولَ اللَّهِ ﷺ بِابْنٍ لَهَا لَمْ يَأْكُلِ الطَّعَامَ فَوَضَعَتْهُ فِي حِجْرِهِ فَبَالَ قَالَ فَلَمْ يَزِدْ عَلَى أَنْ نَضَحَ بِالْمَاءِ  

" He (the Holy Prophet) sent for water and sprinkled it over."  

وَقَالَ فَدَعَا بِمَاءٍ فَرَشَّهُ  

Umm Qais, daughter of Mihsan, was among the earliest female emigrants who took the oath of allegiance to the Messenger of Allah ﷺ, and she was the sister of 'Ukkasha b. Mihsan, one amongst the sons of Asad b. Khuzaima. He (the narrator) said: She (Umm Qais) told me that she came to the Messenger of Allah (may peace he upon him) with her son and he had not attained the age of eating food. He (the narrator, 'Ubaidullah), said: She told me that her son passed urine in the lap of the Messenger of Allah ﷺ. The Messenger of Allah ﷺ sent for water and sprayed it over his garment (over that part which was contaminated with the urine of the child) and he did not wash it thoroughly.  

أَنَّ أَمَّ قَيْسٍ بِنْتَ مِحْصَنٍ وَكَانَتْ مِنَ الْمُهَاجِرَاتِ الأُوَلِ اللاَّتِي بَايَعْنَ رَسُولَ اللَّهِ ﷺ وَهِيَ أُخْتُ عُكَّاشَةَ بْنِ مِحْصَنٍ أَحَدُ بَنِي أَسَدِ بْنِ خُزَيْمَةَ قَالَ أَخْبَرَتْنِي أَنَّهَا أَتَتْ رَسُولَ اللَّهِ ﷺ بِابْنٍ لَهَا لَمْ يَبْلُغْ أَنْ يَأْكُلَ الطَّعَامَ قَالَ عُبَيْدُ اللَّهِ أَخْبَرَتْنِي أَنَّ ابْنَهَا ذَاكَ بَالَ فِي حِجْرِ رَسُولِ اللَّهِ ﷺ فَدَعَا رَسُولُ اللَّهِ ﷺ بِمَاءٍ فَنَضَحَهُ عَلَى ثَوْبِهِ وَلَمْ يَغْسِلْهُ غَسْلاً