Sunan an-Nasa'i, Hadith 4216 ⓘ
It was narrated from Umm Kurz that the Messenger of Allah said: "For a boy two sheep, Mukafaatan (of equal age), and for a girl, one sheep,
أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا سُفْيَانُ، قَالَ قَالَ عَمْرٌو عَنْ عَطَاءٍ، عَنْ حَبِيبَةَ بِنْتِ مَيْسَرَةَ، عَنْ أُمِّ كُرْزٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " عَنِ الْغُلاَمِ شَاتَانِ مُكَافَأَتَانِ وَعَنِ الْجَارِيَةِ شَاةٌ " .
also referenced under: Book 40, Hadith 5 (In-Book) & Volume 5, Book 40, Hadith 4221 (DarusSalam)