"A baby boy was brought to the Prophet who then urinated on him. He sprinkled over it with water and did not wash it."
Sunan Ibn Majah Book 1, Hadith 257
← Previous Hadith "Husain bin 'Ali urinated in the lap of the Prophet and I said: 'O Messenger of Allah, give me your garment and put on another garment.' He said: 'Water should be sprinkled on the urine of a baby boy, and the urine of a baby girl should be washed away.'"

Sunan Ibn Majah Book 1, Hadith 256 Next Hadith → "I came to the Messenger of Allah with a son of mine who was not yet eating solid food, and he (the baby) urinated on him. He called for water and sprinkled it over (the urine)."

Sunan Ibn Majah Book 1, Hadith 258