Why can’t a fetus be transplanted from one womb to another?
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When pregnant, your body produces hormones that allow the baby to live and thrive in the uterus. Aside from that, the baby is in the womb, which has all of the essential physiological aspects to continue to grow.
When someone gets pregnant the internal structures shift to make room for an expanded uterus. You can’t just place a fetus into another person without massive changes happening. Also I’d assume like a transplant you’d have to take meds to make sure your body didn’t attack the fetus and invasive organism and that’s meds at likely not good for the fetus. Even then there’s no guarantee the body would accept the fetus. Also none of these pro life women would line up to accept these transplanted fetuses. So there’s no market for it.
Being pregnant isn’t just a baby it’s a series of physiologic changes, the growth of new organs and lots of other stuff. So much so that physically a pregnant woman is as different from a non pregnant woman as women differ physiologically from men. You can’t just grab one and move it. The body wouldn’t allow it.
To elaborate on the significant physical changes the other commenters describe, as soon as a pregnancy begins, there’s hormonal feedback loops that start, for example by secreting human chorionic gonadotropin (this is hypothesized to be a potential cause of morning sickness), and stopping the menstrual cycle in the [luteal phase](https://en.wikipedia.org/wiki/Menstrual_cycle#/media/File:MenstrualCycle2_en.svg). You would have to induce these hormonal changes so that the recipient was at the same “stage” as the donor.
Second, human embryos develop a placenta that is very deeply connected to the mother’s uterine lining compared to most other mammals. Once blood vessel growth begins, you wouldn’t be able to separate the mother and the embryo and have the embryo live.
The only way this could occur is if the fertilized egg were removed before implantation. This would basically be in vitro fertilization, *ultra hard mode*. It wouldn’t be feasible with modern technology, since you can’t tell if someone is pregnant until after implantation has occurred.
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