I heard the Prophet (nay peace be upon him) say: Let the birds stay in their roosts. She said: I also heard him say: Two sheep are to be sacrificed for a boy and one for a girl, but it does you no harm whether they are male or female. (Using translation from Abū Dāʾūd 2835)
النَّبِيِّ ﷺ قَالَ عَنِ الْغُلَامِ شَاتَانِ وَعَنِ الْجَارِيَةِ شَاةٌ لَا يَضُرُّكُمْ ذُكْرَانًا كُنَّ أَمْ إِنَاثًا وَسَمِعْتُهُ يَقُولُ أَقِرُّوا الطَّيْرَ عَلَى مَكَانَاتِهَا