It is narrated from Sayyiduna Samurah bin Jundub (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Every boy is held in pledge for his aqiqah; (an animal) is to be slaughtered on his behalf on the seventh day, his head is to be shaved, and he is to be given a name."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6906