Hello Chris and welcome to the forum. I am gonna have to say that your little one is to young to sex. So no guess from me, I am sure someone with eperience with possible sexual leanings...
looks like a female star tortoise, even though your tortoise is small the males do start to have a change in tail shape by that size, i have been wrong before though
I would lean towards male, you could send him to me for 5 years and I will let you know haha.
Nice looking tortoise either way from the bottom can we see the rest of him/her ?