It was narrated from Qatadah, from Al-Hasan, from Samurh bin Jundab that the Messenger of Allah said: "Every boy is in pledge for his 'Aqiqah, so slaughter (the animal) for him on the seventh day, and shave his head, and a name"
SahihSahihSahih BukhariBook 40 · Hadith 9