The Messenger of Allah ﷺ said: Two sheep which resemble each other are to be sacrificed for a boy and one for a girl. Abu Dawud said: This is a sound tradition, and the tradition narrated by Sufyan is misunderstanding.
قَالَ رَسُولُ اللَّهِ ﷺ عَنِ الْغُلاَمِ شَاتَانِ مِثْلاَنِ وَعَنِ الْجَارِيَةِ شَاةٌ