Premature lambs kept alive in 'plastic bag' womb
April 2017, BBC
When you've got wombs like these, who needs humans?!
So being that humans have a hard time traveling in space, at the speed of light, etc., the way it works is that we put embryos in an artificial womb, complete with artificial moms and artificial breasts with you guessed it artificial milk. Then again, by the time this happens, we won't call any of this "artificial".
image source: Leonardo Da Vinci's study of a fetus in the womb