It was narrated from Abu Harb bin Abil-Aswad, from Abul-Aswad - Abu Khaithamah said in his hadeeth:
Ibn Abul-Aswad from his father - that ‘Ali (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: “The urine of a nursing boy may be sprinkled with water and the urine of a nursing girl is to be washed.” Qatadah said: This is if the infant is not yet eating solid food; if the infant is eating solid food, it is to be washed in both Cases.