Sahih Bukhari Volume 9, Book 89, Hadith Number 317.

Narrated By ‘Abdullah bin Hisham : Who was born during the lifetime of the Prophet that his mother, Zainab bint Humaid had taken him to Allah’s Apostle and said, “O Allah’s Apostle! Take his Pledge of allegiance (for Islam).” The Prophet said, “He (‘Abdullah bin Hisham) is a little child,” and passed his hand over his head and invoked Allah for him. ‘Abdullah bin Hisham used to slaughter one sheep as a sacrifice on behalf of all of his family.