I finally got around to watching the 2010 documentary "Babies" that follows the first year of life of one baby each in San Francisco, Tokyo, rural Mongolia, and rural Namibia. There's no narration. It's like a greatest hits collection of home movies, if they were all beautifully lit.
Babies are pretty much the same (cute) everywhere, so the main interest is looking at the four different environments from a baby's point of view.
Just as you would expect from that popular Hart and Risley study about how professional parents speak 427 million words to their children by age 1 or whatever, while underclass parents can barely be motivated to say "Shut up" to their kids, the Namibian women don't seem to have much to say to their children.