Allah’s Apostle (sallallähu alaihi wasallam) said, “Aqiqa is to be offered for a (newly born) boy, so slaughter (an animal) for him, and relieve him of his suffering.”

(Note: It has been quoted in Fateh-AL-Bari that the majority of the Religious Scholars agrees to the Hadith narrated in Sahih At-TlRMIDHI that the Prophet was asked about Aqiqa and he ordered 2 sheep for a boy and one sheep for a girl and that is his tradition “SUNNAH”)

[Bukhari Book:66 No:380]