It was narrated from Umm Qais bint Mihsan that she brought a small son of hers who has not started eating food to the Messenger of Allah صلی اللہ علیہ وآلہ وسلم. The Messenger of Allah صلی اللہ علیہ وآلہ وسلم took him in his lap and he urinated on his garment, so he called for some water and sprinided it on it, but he did not wash it. (Sahih)