It is narrated from Hazrat Samurah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Every boy is in pledge for his 'aqiqah, so sacrifice should be offered on his behalf on the seventh day, his name should be given on that day, and his head should be shaved.
Hadith Referenceمسند احمد / أول مسند البصريين / 20139
Hadith Gradingحکم دارالسلام:إسناده صحيح، خ: تحت حديث: 5472