It is narrated from Sayyiduna Samurah (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) should be slaughtered on his behalf on the seventh day, his head should be smeared (with blood), and he should be given a name."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6801