Do they eat live newborn pinkies?
Yes, they also can eat F/T pinks, but live is usually easier.
At what age do you sex them & how? Pop or probe.
I probe after they eat (a week or so after their first shed). I would NOT probe any snake if you've never done it before. Have someone with experience show you the proper way.
They look too small to try & pop them.
I think popping is even more dangerous(in my opinion)...I would avoid this method personally, but again you need someone with experience to show you the correct way.
Good luck,
Rusty
Check this link if you don't have anyone that can show you first hand:
Link