If they havent colored yet there was some diference in their genitalia, however I cant help with that Buy already colored ones, they wont be that old and will reward you with some babys
Take a group of five to ten and feel between there legs I'M NOT KIDDING you can feel the space differance from males to females think about how big there eggs are they need a very wide pelivic structsure to make it through you can barely tell there's a space at all on males I've breed them on and off for the last 20 years