Admittedly, I am not the best at sexing these guys yet. I usually get confirmation from John. Yours is still fairly young; I don't yet see vivid orange coming through on the legs and up into the throat. My female is roughly the size yours is now, but has a cream colouring to her throat and a bit of yellow. My males (one is 7", the other is almost 8" svl) and have vivid yellow and orange on their limbs and onto their throats. At 5-6 months of age, if yours is male, he will grow. Continue to feed him high protein foods (earthworms, locusts, roaches, crickets) every other day and you will see a happy, healthy frog. Regardless of size, you have a very nice looking frog!