This may sound kind of stupid...But, how do you tell apart a male iguana from a female iguana. We have 2 baby iguanas and i asked the guy at the petshop how to tell them apart but he started to mumble and then he walked away.
You have to do it visually. The male with have bumps on the inner thigh of the back legs next to the vent. You will have to wait to your lizard matures a bit more before it notices though.