[Machine] The Messenger of Allah ﷺ forbade qaza'a. Qaza'a is shaving a part of a child's head and leaving another part, in accordance with the narration of Yahya bin Sa'id.  

نَهَى رَسُولُ اللهِ ﷺ عَنِ الْقَزَعِ وَالْقَزَعُ أَنْ يَحْلِقَ بَعْضَ رَأْسِ الصَّبِيِّ وَيَدَعَ بَعْضَهُ لَفْظُ حَدِيثِ يَحْيَى بْنِ سَعِيدٍ  

Messenger of Allah ﷺ forbade Al-Qaza' (leaving a tuft of hair here and there after shaving one's head.) (Using translation from Bukhārī 5921)   

نَهَى رَسُولُ اللهِ ﷺ عَنِ الْقَزَعِ