Did Leslie stefanson have a boy or girl?

He is a boy.

Through their maturity levels and their genitalia structure. Gender is determined by chromosomes A male has an X and a Y chromosome. a female has 2 X chromosomes

mama cells and daddy if mama give you more than dad you are a girl if dad give you more than mom you are a boy

They both hit.

He's a boy, though in the 2003 TV series, he has a little sister built by Dr. O'Shay, named Zoron. Her name was Uran in the Astro Boy manga.Well, judging from the name Astro BOY, he's probally a boy.