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And others point out that labiodental sounds have even been found among hunter-gatherers with edge-to-edge bites, like some Yanomami people of South America, who live mostly as isolated hunter-gatherers, fishers and horticulturists.

To test this hypothesis, they analyzed databases of the world’s consonants and showed contemporary hunter–gatherer languages contain only a fraction of the labiodental sounds that food-producer languages do.

In particular, it becomes much easier to say “f” and “v,” which linguists call “labiodental” sounds.

Further analysis found that labiodental consonants could have spread rapidly in languages since the dawn of agriculture, to the point that they are found in half of the 7,000 or so languages still spoken.

The w in Dutch is mostly labiodental; in the eastern parts before vowels bilabial pronunciation is heard.