If this was an unmarked real photo postcard, I would say this is a little girl. Following the rules..girls part their hair in the middle, boys part their hair on the side. I would be wrong.
This is Glenn Arthur Goddard, this is an Azo Real Photo Postcard with triangles pointing up which means it is from 1904 to 1918. Again we have a child wearing a larger belt, maybe it was a boy thing to wear the belt. I got this postcard at an Antique Shop in Park Rapids..as you can see it was fifty cents.