Umm Qays bint Muhsin reported,

I came to the Prophet ﷺ with a young son of mine who was not yet eating solid food, and he urinated on him. So he called for water and sprinkled it over the spot.

ودخلت على النبي ﷺ بابن لي لم يأكل الطعام فبال عليه فدعا بماء فرش عليه