The Messenger of Allah (may Allah's peace and blessings be upon him) forbade Qaza‘.
(qaza:shaving part of a boy's head and leaving other parts unshaven)
[Al-Bukhari]
Original Hadith
"نهى رسول الله -صلى الله عليه وسلم- عن القَزَع.
[صحيح] - [متفق عليه."