Agreed, I'd rather know for sure. However, what is the "right size probe" for a hatchling? I've never even been given a real opinion about what the right size is for an adult.
My biggest concern with probing at this point (besides the obvious concerns) is I can't even really see the scales on their little tails to count!
I did re-pop a couple of them this evening, and one popped male, so I think I needed to work on my technique a bit. I'll probably probe the snakes that popped female once they age a little bit.