Various news outlets are reporting on work published in Nature Communications (open, DOI: 10.1038/ncomms15112) (DX) on:
[...] a system that incorporates a pumpless oxygenator circuit connected to the fetus of a lamb via an umbilical cord interface that is maintained within a closed 'amniotic fluid' circuit that closely reproduces the environment of the womb. [...] fetal lambs that are developmentally equivalent to the extreme premature human infant can be physiologically supported in this extra-uterine device for up to 4 weeks.
Coverage:
Related stories:
Scientists Keep Human Embryos Alive Longer Outside of the Womb
Prematurely Born Lambs Kept Alive With Artificial External Placenta - Human Babies Could be Next
(Score: 3, Informative) by Scruffy Beard 2 on Friday April 28 2017, @01:32AM
This current technology only works on fetuses developed enough to have a heart.
(That is what "pumpless" is about in TFS: the heart serves as the blood circulation pump.)