i honestly don't know the evidence based research on health risks for mom or baby. i know you were looking for literature but all i have is an opinion. lol
i don't know how it could be safe? if it alters one's mind, wouldn't it alter a growing mind? if it can make one addicted to a hallucinogen, would not a baby get addicted? if it can decrease oxygen and blood flow, wouldnt it do the same for the baby? if it causes side effects for mom, wouldnt it for baby? (imagine the baby getting the munchies inutero

) how does one know it is really really safe...safe level of THC, how does one know where it really came from, and what it if is laced with something else?? it just doesn't seem healthy or safe
to me, even if it is organic

. i'm always open to reading more about it and learning otherwise. the sources so far aren't evidence based enough for me yet.
beyond that, i don't think it is safe for any pregnant mom to do anything illegal. (im in the south US on the border of mexico, so not going to find it legal here). it's not safe for her to do a "drug deal". it's not safe for her mind to be altered. it's not safe for her to get arrested. it's not safe for her go to a filthy jail for "possession". it's not safe for her to have to pay fines, get a record, and risk her "fit mother" status. it's not safe for her baby to be taken away from her when her bloodwork comes up positive for illegal drugs. (of course if you get it prescribed it would be another story, but where i live, that wouldn't happen). Also it is not safe to smoke pot while breastfeeding-so you put baby at risk there....
Even if it is considered "safe" during pregnancy, because of lack of studies, it is known to not be safe while breastfeeding. THC is transferred into breastmilk- levels can be up to 8 times higher than in the mom's bloodstream. I learned as an IBCLC that exposure to marijuana through breastmilk can delay infant development. The American Academy of Pediatrics considers it as a contraindication for breastfeeding and we are advised to say that moms should abstain from all use of THC while breastfeeding.
i think if a mom wants to smoke a joint with her kid, say when he is 18, then i say go ahead. they can make their own choices at that age. they can weigh the risks and benefits. but until then i wouldnt risk this important part of development for what we dont know.
and on another note. if you live on the border of mexico you may see what i see and hear the stories i hear about drug smuggling. if not, then read up on what is going on and see what marijuana is doing to our families here and abroad. men women and children are all dying to get Americans their pot (among other drugs). as long as there is a demand, they will keep dying. lately women have been kidnapped, decapitated, have had their breast branded by the drug lords . im not saying thats where i think all US pot comes from, of course not, but if its not prescribed/not grown in the US, then please have a second thought.
like i said, just my opinion
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