Amr bin Shu'ayb narrates from his father, from his grandfather (may Allah be pleased with him), that the Prophet (peace and blessings be upon him) was asked about the aqiqah, and he (peace and blessings be upon him) said: "Allah, the Lord of Might, dislikes 'al-uquq' (disobedience)." It was as if he (peace and blessings be upon him) disliked the very name aqiqah. And he said: "Whoever has a child born to him and would like to offer a sacrifice on its behalf, then two equal goats for a boy and one for a girl."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19274