my son was born on a regular adar it was not a leap year and this year he is turning 3 . when would someone give a haircut on adar 1 or adar 2
Cutting a child’s hair at the age of three is a custom from recent generations and not based on the Talmud. As such there would be more leeway to give the haircut in either Adar. In terms of his halachic birthday, this would be only in the second Adar.
Shulchan Aruch, Rama O:C 55:10, Shu”t Mahari Mintz 10