Just like you would normally. Just check and you will know. better do it now while they are babies, when they are older its harder to get ahold of them!
yeah put it on it's back in your hand then with the other check things out - further spacing between anus & a 'cylinder' unit = boy. short distance & a pyramid unit= girl
YAY i have always had bucks and LOVE THEM they are so funny, i don't know if females do this too but they nest nonstop when you take them out to play haha