i assume they don't have kids...
Researchers have found that babbling baby talk isn't just random sounds but a deliberate attempt at language. By studying babies 5 months to a year old, researchers found that the sounds babies make are controlled, not just random.
Shoot, I could have told them that. My youngest daughter is a little more than a year old now, and while she has a few words, she mostly speaks what I call "Babish." But there's no doubt that as far as she's concerned, she's saying things...she'll rattle off a whole sentence or two in babish.
I've actually wondered if my youngest isn't really saying more words than we think, and we're missing them. When our first daughter began to speak, we were listening so closely to her speech that we could really pick out when she she said recognizable words among the babish. Now she's three and quite the little chatterbox, so there's a certain amount of competition (and distraction) for our attention. On the other hand, The Baby has one more person talking to her, and I'm sure that helps too.