757
Musnad AhmedIt was narrated from "Ali bin Abi Talib (رضي الله عنه) that
The Messenger of Allah (ﷺ) said concerning the nursing infant: "Sprinkle water on the urine of a boy and wash the urine of a girl." Qatadah said: This applies so long as they are not eating solid food; if they are eating solid food, then it is to be washed in both cases.
Reference: Musnad Ahmad 757
Arabic/English book : Book 5, Hadith 757
Arabic/English book : Book 5, Hadith 757