If you really, really want to have baby iguanas to keep one or two of the offspring, it takes some will. What you'll have to do first, is wait. Wait 5 or 6 years, and keep your igs extremelyl healthy, until they are an age thats appropriate to breed. Then you'll have to wait while your (you hope) female grows eggs, and hope she doesn't die from being egg bound. Once the eggs are laid, you'll have to crush or freeze the bulk of them, and keep only two or three. Those you'll have to incubate those eggs very carefully, and hatch them carefully, because you have no room for mistakes. If thats what you really want to do, all the more power to you, but do not introduce iguanas to the world that you will not be keeping directly.