Hello. It is easier to tell once they have reached approximately 1 year or older. Post a photo and maybe I or someone else can take a shot at it.Arklier said:At what size should it be obvious what sex they are? My azureus are about 1.5" long from nose to vent, and both of them have small front toepads. I'm trying to figure out if I have two females, or a male that's a late bloomer.