Sunan an Nasai 4215
The Book of al-'Aqiqah
أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا عَفَّانُ، قَالَ حَدَّثَنَا حَمَّادٌ، عَنْ قَيْسِ بْنِ سَعْدٍ، عَنْ عَطَاءٍ، وَطَاوُسٍ، وَمُجَاهِدٍ، عَنْ أُمِّ كُرْزٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " فِي الْغُلاَمِ شَاتَانِ مُكَافَأَتَانِ وَفِي الْجَارِيَةِ شَاةٌ " .
it was narrated from Um Kurz that the Messenger of Allah said:"for a boy two sheep, Mukafaatan (of equal age), and for a girl, one sheep
Grading: Abu Ghuddah: Sahih · Al-Albani: Sahih · Zubair Ali Zai: Sahih
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.