Hadith 764
It is narrated from Sayyida Umm Qais bint Mihsan (may Allah be pleased with her) that she brought her son to the Messenger of Allah (peace and blessings be upon him), who had not yet learned to eat food (i.e., he was an infant). The Messenger of Allah (peace and blessings be upon him) seated him in his lap, and the child urinated. The Prophet (peace and blessings be upon him) called for water, sprinkled it over (the garment), and did not wash it.