if they are all the same age....in the next few months you will notice the males become leggier, and generally larger. The longer legs is usually what I notice first.
yes I agree.. give a few months, if all are same age. By the time they are 6 months old, the males will be getting bigger/taller with longer and thicker legs and toes than the females. with 5 you should have them in both sexes and so the difference will show up eventually.