Looks right to me.....but sometimes those girls can turn into boys as they get a bit older, lol. At only a month old, sometimes the male "bulges" aren't apparent yet. I wouldn't trust the sexes 100% until they are a few weeks older.....but that just my experience.
I've found if you give the tails a slight twist back and forth (gently, of course) sometimes bulges that are hiding will pop up....
