It was narrated from 'Ali that :
The Prophet said concerning the urine of a nursing infant: Water should be sprinkled over the urine of a boy, and the urine of a girl should be washed. Abul-Hasan bin Salamah said: Ahmad bin Musa bin Ma'qil narrated to us that Abul-Yaman Al-Misri said: 'I asked Shafi'i about the Hadith of the Prophet, Water should be sprinkled over the urine of a baby boy, and the urine of a baby girl should be washed, when the two types of water (urine) are the same. He said, This is because the urine of the boy is of water and clay, but the urine of the girl is of flesh and blood. Then he said to me: Did you understand? I said: No. He said: When Allah the Most High created Adam, He created Eve (Hawwa') from his short rib, so the boy's urine is from water and clay, and the girl's urine is from flesh and blood. Then he said to me: Did you understand? I said: Yes. He said: May Allah cause you benefit from this.
حَدَّثَنَا حَوْثَرَةُ بْنُ مُحَمَّدٍ، وَمُحَمَّدُ بْنُ سَعِيدِ بْنِ يَزِيدَ بْنِ إِبْرَاهِيمَ، قَالَا: حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ، أَنْبَأَنَا أَبِي، عَنْ قَتَادَةَ، عَنْ أَبِي حَرْبِ بْنِ أَبِي الْأَسْوَدِ الدِّيلِيِّ، عَنْ أَبِيهِ، عَنْ عَلِيٍّ، أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ فِي بَوْلِ الرَّضِيعِ: يُنْضَحُ بَوْلُ الْغُلَامِ، وَيُغْسَلُ بَوْلُ الْجَارِيَةِ .
علی رضی اللہ عنہ سے روایت ہے کہ نبی اکرم صلی اللہ علیہ وسلم نے شیرخوار بچے کے پیشاب کے بارے میں فرمایا: بچے کے پیشاب پہ چھینٹا مارا جائے، اور بچی کا پیشاب دھویا جائے ۔