Very nice closeups! Mr. Gecko definately is a male, I can tell you that, but the younger one is unsexable. You're just going to have to wait a few months (at least). If its a female, she'll start dropping infertile eggs once she matures. Males get the yellow and the enlarged pores as you know.

You've got a 50/50 chance - thats all anyone call tell you for sure.
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- Joe Farah