It is narrated from Sayyiduna Samurah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "A boy is held in pledge for his aqiqah; the aqiqah should be offered on his behalf on the seventh day, his head should be shaved, and he should be given a name."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6802