Hermes didn't create Bender. He only approved Bender's design (despite his flaw) so Bender could leave the factory and not be dismantled.
I doubt the majority of the show's viewers is that obsessed over every little detail. Based on what I've been reading here in this talkback, it's only you and 1 other poster who are 'sweating the small stuff', as it were. I don't think the show's fans in general care that much.
Does a baby robot make sense? No, it doesn't. But it doesn't have to, because Futurama is a animated show done in humor, therefore every little thing about it doesn't have to make perfect sense all the time. Anyway, it's been done before: in "Teenage Mutant Leela's Hurdles", Bender was de-aged along with the other characters, though robots don't age like people do nor do they have skin, so really the aging tar really shouldn't have had any affect on Bender, but that would've worked against the story. But nearly everything about the robots on Futurama doesn't make sense when you think about it: take Tinny Tim. Who would build a robot just to be a poor orphan? Or Santa-Bot. Why doesn't Earth's armies just fly to Neptune and destroy Santa-Bot once and for all? After all, he's just one robot, and everyone knows where he lives, so why doesn't DOOP do something about him? Earth had no problem driving the alien balls off of their own planet in "War is the H-Word", so why can't they just go Neptune and take out Santa-Bot? And wouldn't an insane asylum for robots ("Insane in the Mainframe") be a waste of time and taxpayers' money? Wouldn't it just be easier to demolish and/or recycle them all? Or when Calculon Jr. malfunctioned in "Bender Should Not be Allowed on T.V.", why did they hold auditions for a new robot child when they could have just replaced him with another identical model? In that same episode, one robot kid had a pushy robot mother, which also doesn't make sense since robots wouldn't have parents and siblings the way humans do unless someone built a set of robots to be a family unit, but it parodied a scene in Mommie Dearest, so it was necessary for the joke.
My point: the writers have always taken liberties with logic in order to make the stories work. This isn't a new thing for Futurama or dozens of other cartoon shows. So I don't see the point of holding the show under a microscope and criticizing it for something which has been going on for years now.
In all likelihood that just won't brought be up again. Honestly, I think some of you guys take these shows way too seriously. There's no need to be so obsessed with logic and episode-to-episode continuity. Sometimes you just have to roll with it. Futurama is just a comedy cartoon, folks. Take it easy and enjoy it for what it is.