It is narrated from Sayyidah Umm Qays bint Mihsan (may Allah be pleased with her), who was among the first Muhajir women who gave the pledge of allegiance to the Messenger of Allah (peace and blessings be upon him) and was the sister of Sayyiduna Ukkashah bin Mihsan (may Allah be pleased with him), that she brought a son of hers, who had not yet reached the age of eating food, to the Messenger of Allah (peace and blessings be upon him), and he urinated in the lap of the Prophet (peace and blessings be upon him). The Messenger of Allah (peace and blessings be upon him) called for water, sprinkled it over his urine, and did not wash it.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21906