The whole "waste disposal pipeline routed through a recreational area" thing... Tell me you've heard this joke... Well I just gave away the punchline so nevermind...

I would not put the sewer so close to the play-pen.

The little toe. I would’ve gotten rid of it. I mean, it’s bad enough that it serves little discernible purpose… But it’s almost magnetic attraction to the corner of furniture really pisses me off!

I would have devised a varying metabolic rate that kicks into overdrive whenever you eat fat and/ or sugar so that you always stay at a perfect weight. And also arteries that don't clog up

i would make the central nervous system repareable

Scrap the whole thing, start from scratch.

Put one eye in the back of head.

Wtf is up with spines? "hey, i know. lets put the big central rod thing through the body and make all the nerves and shit in it... and hope it holds this upright ape".

How about not putting the fuel intake and the air intake right next to one another?

There's no reason to frame this question within a theistic premise. We have the technology to modify humans so that the modifications are passed on to offspring, although still in early stages. CRISPR

I have no thoughts of gods designing a human body and if I did have it would disturb me greatly. I have distanced myself as much as possible from religions. Gods are imaginary.

I would study other animals in the kingdom and incorporate as much as I could of their best features. For example, a head that can turn almost 180° like an owl, a pouch for carrying babies like a kangaroo

A "good" god would never have created carnivores whilst equipping their prey with the ability to feel terror and pain!

Winged hermaphrodites with 6 arms and awesome boobs.

I think the sensible thing would have been not to allow humans sentinent thought.

I have always felt that one of the strongest arguments against a supposedly intelligent creator is the fact that we need to urinate and defecate, an admittedly rather inconvenience and disgusting requirement in being a human, lol... If I were like this god supposedly is, a being who literally had any creative concepts opening to it, I would have designed the human to make use of whatever nutrients that it ingested, making sure that there was no need for waste of any kinds to be a byproduct... you would think that an all-powerful deity would have considered this, given that, as I mentioned, he literally had no limitations and every possibility open to him... Yet apparently designing humans that are required to have to pass waste from their bodies repeatedly until they die somehow seems like a great idea...yeah, I'm just not buying it...

So, as someone interested in african womens health, there are several documentarys on the state of reproductive medical care. Any modern day woman with 1st world healthcare may know about the risk of tearing during birth. Here its prevented by preemptively snipping the flesh between anus and vaginal canal. Well in Africa, those poor women might experience multiple types of permanent damage. Some get no medical intervention to repair a descended vagina, constant urination or defecation, and horrifically some babies are trapped behind the pelvic bone and die and can't be removed. What the actual fuck human female bodies?!

So yeah, pregnancy and birth needs a whole new process. My vote is eggs.

I wouldn't have made humans

No shitting and no gaining weight. Make the food just naturally disolve in the body. No wrinkles....just soft smooth skin forever!!

childbirth if I could only change one thing

Webbed extremities would have been a nice feature to have kept during the whole process.

Testicles. Yeah, put them on the inside!

Knees

Everybody would be black; less skin cancer. Also I'd get rid of sickle cell anemia in black people ?.

Basilar membrane cillia capable of self repair/regrowth.

No machular degeneration.

Regenerating neurones and nerve cells...

Everything. I'd change everything.

Rat's teeth that constantly grow, like fingernails.