I heard the Prophet ﷺ say, "Leave the birds in their nests."She said, I also heard him say, "For a boy, two sheep are to be sacrificed, and for a Jariya, one sheep. It does not matter to you whether they are males or females."
حدثنا مسدد حدثنا سفيان عن عبيد الله بن أبي يزيد عن أبيه عن سباع بن ثابت
سمعت النبي ﷺ يقول أقروا الطير على مكناتها قالت وسمعته يقول عن الغلام شاتان وعن الجارية شاة لا يضركم أذكرانا كن أم إناثا
[Hasan] Nasai narrated it in the chapter on Aqiqah, section "How much should be sacrificed for a girl," no. 4222, from the hadith of Sufyan bin Uyayna, with this wording. Ibn Hibban graded it sahih, no. 1059, as did Hakim, 4/237, and Dhahabi concurred with him.