Ibn Abi Mulaykah says that a child was born in the house of Abd al-Rahman bin Abi Bakr (may Allah be pleased with him), and it was said to Sayyidah Aishah (may Allah be pleased with her): "O Mother of the Believers, perform the aqiqah on behalf of this child with a camel." She said: "Ma'adh Allah (Allah forbid)! Rather, the Messenger of Allah (peace and blessings be upon him) spoke of slaughtering 'two equal goats'."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19280