It wasnarrated from Samurah that the Prophet (ﷺ) said:
"Every boyismortgaged by his 'Aqiqah, so slaughter for him on the seventh day,and shave his head, and name him." (RU)
English reference (RU): Vol. 4, Book 27, Hadith 3165 (RU)
Arabic reference (RU): Book 27, Hadith 3285 (RU)