It is a Sunnah to
slaughter two identical sheep for the `Aqiqah of a baby boy, and one sheep for a baby girl, as was authentically reported from
`Aishah (may Allah be pleased with her) that the Prophet (peace be upon him) said,
Two sheep of similar age and quality are to be sacrificed for a baby boy (as `Aqiqah) and one sheep for a baby girl.
Al-Tirmidhy, and ranked by them as Sahih [authentic])
It was also reported from
Ibn `Abbas (may Allah be pleased with him)
that the Messenger of Allah (peace be upon him) sacrificed a ram for both al-Hasan and al-Husayn each.
Abu Dawud and
who said "two rams for each", which is the best. As for the required amount, it is the same as the Ud-hiyah (sacrificial animal offered by non-pilgrims).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.