Saw this article about a fertility clinic mixing up embryos and implanting them in the wrong women.
It was only discovered when the babies were 3months old, and the parents swapped babies back at that point.
Could you have given up the baby you grew, carried, loved and bonded for 3months, and swap it for another, even if that other baby was genetically yours?
Or do you keep the baby and know that he/she isn’t yours, and your baby was out there somewhere?
What a choice to have to make 
news.sky.com/story/amp/two-california-couples-give-birth-to-each-others-babies-after-mix-up-at-fertility-clinic-12464274