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Not a med school student but fraternal twins come from 2 separate zygotes - 2 different eggs and 2 different sperm cells. If you disregard the whole 'two uteri' aspect they'd be twins, fraternal twins, dizygotic. It's all two eggs being fertilized at the same time, right?
What happens if the pregnancies were, say, 5 months apart? What kind of complications would there be?
Pregnancy hormone HCG caused ovulation to stop its normal cycle. Essentially, their are either the same age or the first pregnancy already ended and needs to be removed, but due to complications the younger embryo probably won't make it either.
A natural birth consists of a bunch of hormonal changes that initiate the process (similar to a medically induced abortion); I’d be super surprised if the younger fetus doesn’t abort when the older one is birthed on time.
I was going to ask if other animals were capable of multiple simultaneous pregnancies, but then I figured I should probably just google it.
Interestingly I found that it has indeed happened to humans, but it confirms your idea, because in the latest documented example, the children were born at the same time.
https://en.m.wikipedia.org/wiki/Superfetation
All mammals that give birth in litters have one large and “lumpy/compartmentalized” uterus. Opossums (not mammals) for example have a forked reproductive tract which forks in the vaginal canal with two distinct “halves” leading to a different uterine compartment. I don’t think there’s any animal with two completely separate uteruses; please correct me if there is one though 😛
I mean this post is about one
According to the article, they didn't need to be but likely were. Makes sense, thanks.
Though would they end up being delivered at the same time?