Abu Dawud Book 1, Hadith Number 374.
Chapter : How to clean the clothe smeared with the urine of a child.
Narated By N/A : Umm Qais, daughter of Mihsan reported that she came to the Prophet (PBUH) with her little son who had not attained the age of eating food. The Apostle of Allah (PBUH) seated him in his lap, and he urinated on his clothe. He sent for water and sprayed it (over his clothe) and did not wash it.