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Why do Chernobyl* chasidim do upsherin at the beginning of the third year?
* Including Trink, Skver, etc.
Nitei Gavriel Taspores 2:1:2 says the source of those who do it at 2 is based on Braishis 21:8 "Vayigdal Hayeled" and Rashi says that was at 24 months. Also Shmuel-1 1:22.