Now, you're going to have to read slowly here. And carefully, to 'get' the full depth of what has just happened in Sweden, actually on October 6, 2014. Just yesterday!
First of all, a lady was born without a uterus; this is a congenital defect, Rotikansky syndrome. The second lady was 61 years old, and she donated her uterus to the first lady. (That has been done before, and attempted in vitro fertilization in a transplanted uterus has failed 11 times prior).
After about a year, the lady had established her periods (they don't say if she was on hormone therapy or if she was born with her ovaries), and on the first attempt, was able to carry her pregnancy to full, live birth by C-section at 31 weeks and 5 days.
There were about three times that her body wanted to reject the uterus, so they gave her immunosuppressant drugs like steroids, and calmed her body's response down. She developed preeclampsia and the decision to deliver was made, as described.
Short Stories about Dr. Margaret Aranda