Also this is a real life gizmo: http://nursinglink.monster.com/rn-jobs/articles/2288-medical-wonders-almost-skin Space PJs

A bacteria that stunts the growth of people? http://culturesandknowledge.blogspot.com/2013/09/elf-girl-strange-wonders-of-world.html

Using sea coral to regrow bones: http://www.torontosun.com/2013/11/29/researchers-use-sea-coral-to-regrow-bones

Some real brain med stuff: Note some of this only sort of works (we receive training on some of these things at work): http://www.scientificamerican.com/article/implant-epilepsy-seizure/

Could be part of a Space Human Culture... they do the pregnancies in labs now, safer for the mother and child and allows the mother not to burdened with primiative biology. 

Or Alien Mad Scientist Time: 

The Vrusk Doctor and Dralasite Doctor on the UPF Ranger stare at the mediscanner, the Vrusk clicks agitated and the Dralasite chuckles, one thing the Marine Sargent had learned as a Private when a Vrusk & a Dralasites make such noises together the outcome will somehow be both unpleasant and sickly humorous...  surely there was a treatment, the docs always make you sweet, too teach you a lesson.

Vrusk to Dralasite "I think you should tell him."

"Tell me what?"

Dralasites: "Congratulations you are in your first trimester"

"My what?"

Vrusk: "Do you wish to know the child's gender, I understand this is a sensitive issue with some humans?" 

"What!?!"

Dralasites: "Calm yourself, in your condition... you have to think of the child... do you know who the father or is it mother was? She-he should be informed."

Vrusk: "Are you sure you only copulate with the approved species list for your species on shore leave?"

"I'm pregnant!"

Together: "Yes."

Dralasite: "I think Bloop is a good name for a boy, have you thought of names yet Sargent Johnson?"

But the conversation in sickbay with the guy who is pregos would be funny... what if a male Yazirian became pregnant? How well would he take that? Or for that matter several other races... the races's culture has to play a big factor in how the male reacts, and also how the other sentient creatures react.

 All the medical staff reactions & then the chain of command would get involved if this occurred on a UPF ship, is this a threat to the UPF? A private group of citizens dealing with a pregnant buddy would have other stresses, maybe a mega corp wants the buddy & unborn child to study, maybe their next if they don't escape the mad scientist, how to procure the medical supplies and help without involving the UPF or mega corps or a local government all who might react in negative ways...how to protect subject X & baby from the media finding out.

How would one's friends & family react? 

Having an NPC get pregnant works, but if a player is open to the idea, it could be really fun to RP, the ref could have pre-set note cards that at various points in the adventure that are given to just that player for only their eyes, that indicate the pregnancy issue the player needs to RP... like a sudden craving for large quantities of "Zurp Fruit" which smells like skunk to the rest of the crew or you need to nest it is nursery building time or the ship is clearly filthy and needs to be obsessively cleaned. You feel a need to try and make as many thongs as possible safe for small children, and rant about anything you can't as a death trap & who designed it!  

With the right people it could be a hoot, with the wrong a total flop. 

Of course after the baby is born that could lead to a whole new set of challenges... depending on the scenario, a mad scientist just seeing if men can be pregos means a normal looking child of your race (child could be a mutant though, or genetically engineered to grow at an accelerated rate and will not live long for study reasons, unless a treatment is found, mu wah ha ha.) But if a totally new alien race was involved then either the male is just a host for a 100% alien being, or 50% DNA is the male's... the child might look very different. 

The themes of the adventure can allow for exploring gender roles in SF of various races, allows PCs to show case (develop) customs of their races concerning reproduction stages, birth, naming, & child raising, explores ethical problems such as should you try and destroy a life form you don't actually know is evil because it is alien,  if the child's growth goes from normal to accelerated and no treatment is found it allows birth-life-death cultural elements to be explored and possibly a serious revenge motive for the PCs... someone needs to die for hurting their child... imagine if a ship had a majority of Yazirian crew a couple others and the Yazirian child was gifted & much loved and then dies because they where genetically programed to die by the mad scientist who has already escaped once... oh the hunt would be on. The hunt for a treatment could be a reason for a ship to leave Frontier Space. A child clearly of unknown origin could also be a reason to leave UPF space, maybe the birth happened in a local gov's space... now they have found out & want the child, if in UPF space lanes, the UPF scientists want the child... they got to rescue munchkin and skip town as fugitives. In using the child as a plot element I think it should be used as an occasional trigger but not over done... thus once out of UPF space "treatments" could work sort of, this keeps the ship moving on to new places but also allows for other adventures unrelated to looking for medical care. 

Anyhow some musings on how a little weird science could actually create a whole backstory & motive for a group long term. 

Catching up on this old topic. What a list from Tch!