I saw it Sunday and thought it was really beautifully done; I'd highly recommend it.
It was really just incredibly fascinating seeing how similar and how different the babies are across four continents. Especially because of the way it's done, probably what you take away depends quite a bit on your prior experiences and expectations going in. I could tell that some audience members were just horrified at parts, and others saw it as just a bunch of cute footage, and others as a comment on the differences between rasing babies in first and third world countries.
I also appreciated that there weren't any subtitles or narration, but I did wonder about a few things. Does anybody who's seen it know if the two African mothers were co-wives? Or mother and daughter? Or just relatives/friends?