Narrated As-Sa’ib bin Yazid: (While in the company of my parents) I was made to perform Hajj with Allah’s Messenger (peace be upon him) and I was a seven-year-old boy then. (Fath-ul-Bari, p.443, Vol.4)
28 Penalty of Hunting while on Pilgrimage
Hadith number 1858
Volume no 3
Chapter: 25 (The Hajj of boys (children etc.)