Upsherin is cutting a boy's hair at or about the age of three for the first time. Is there any 'Inyan (idea) of an Upsherin for girls? Why or why not?
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if by "Inyan of Upsherin" you mean hair cut then see @Danny Schoemann's answer
but if by "Inyan of Upsherin" you mean the Inyan of chinuch
from this answer
then some have a custom for girls to light candles at 3.
A classic source for the Upsherin is the שערי תשובה in שו"ע או"ח סי' תקלא סק"ז
"The custom in the land of Israel is to make a joyous occasion out of the child's first haircut, when one inaugurates him into the concept of [not destroying] his [Halachic] sideburns."
Since girls do not have the Mitzva of פאות הראש, there would be no sense to making an Upsherin ceremony for them.