´Narrated Umm Kurz:` That she asked the Messenger of Allah (ﷺ) about the 'Aqiqah. He said: "For the boy is two sheep, and for the girl is one, it will not harm you if they (i.e. the sheep) are male or female."
Hadith Referenceسنن ترمذي / كتاب الأضاحى عن رسول الله صلى الله عليه وسلم / 1516