Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
abudawud:379ʿAbdullāh b. ʿAmr b. Abū al-Ḥajjāj Abū Maʿmar > ʿAbd al-Wārith > Yūnus > al-Ḥasan from his mother

Al-Hasan reported on the authority of his mother that she was Umm Salamah pouring water on the urine of the male child until the age when he did not eat food. When he began to eat food, she would wash (his urine). And she would wash the urine of the female child.  

أبو داود:٣٧٩حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَمْرِو بْنِ أَبِي الْحَجَّاجِ أَبُو مَعْمَرٍ حَدَّثَنَا عَبْدُ الْوَارِثِ عَنْ يُونُسَ عَنِ الْحَسَنِ عَنْ أُمِّهِ

أَنَّهَا أَبْصَرَتْ أُمَّ سَلَمَةَ تَصُبُّ الْمَاءَ عَلَى بَوْلِ الْغُلاَمِ مَا لَمْ يَطْعَمْ فَإِذَا طَعِمَ غَسَلَتْهُ وَكَانَتْ تَغْسِلُ بَوْلَ الْجَارِيَةِ