My design for humans 2.0: Everything the same, except with some key differences:
1. Those with a uterus will no longer have periods, which will be because:
2. The previous uterus will be downgraded in size, and will allow the egg to attach without having been "prepped" the way it does now. This will be because the reaction to a fertilized egg will be to immediately increase blood flow.
3. There is no longer a placenta, as humans 2.0 will be marsupials.
4. After a month or two pregnancy, the uterus owner will give birth to the tiny baby, where it will be put into the pouch of a penis owner, who will suckle the tiny baby until it's big enough to leave the pouch.
This was cross-posted from
https://alex-antonin.dreamwidth.org/319942.html You can comment either here or there.