The Messenger of Allah (may Allah's peace and blessings be upon him) slaughtered a ram for Al-Hasan and a ram for Al-Husayn for their ‘Aqīqah. [Abu Dawood]
عن ابن عباس «أن رسول الله -صلى الله عليه وسلم- عَقَّ عن الحسن والحسين كَبْشًا كَبْشًا». (أبو داود)