I have 2 FBTs that I bought fron pet store couple weeks ago. one appears to be definitely female-larger than her sibling, wider body, middle finger longer than rest (I've heard that determines female-who knows if true?). The other one is skinnier (but eats more) and has a pointier snout and he's smaller. They're the same age because they're siblings from same batch of eggs. Just trying to figure out what's what and who's who. Also, is there any way to determine the approx. age? The larger one is 2 inches and the smaller one is about 1 3/4 inches. Thanks!