The Messenger of Allah ﷺ performed the aqiqah for Hasan and Husayn with two rams each.
أخبرنا أحمد بن حفص بن عبد الله قال حدثني أبي قال حدثني إبراهيم هو ابن طهمان عن الحجاج بن الحجاج عن قتادة عن عكرمة
عق رسول الله ﷺ عن الحسن والحسين رضي الله عنهما بكبشين كبشين
Sourcing, sahih. Tabarani reported it in Al-Kabir 11/311, hadith 11838, from the hadith of Ahmad bin Hafs, with this chain, and it is also in Al-Kubra, hadith 4545. It has another route with Abu Dawud, hadith 2841, from Ikrima, with this chain, and its chain is sahih. Ibn Jarud also graded it sahih, hadith 912.