If soft diet was the main problem, then you'd think almost nobody would be good looking. Why are some babies born with model faces and most aren't?

@crimsonchin

Soft diet probably has little to no relation to crooked teeth and underdeveloped jaws. All other factors are secondary to the fact the tongue isn't on the roof of the mouth, the tongue is what grows the jaws so that the teeth can fit. My personal theory as to the effect of diet is that the quality of the diet, not the toughness, is what matters. "Baby food" is absolutely atrocious, not because it's soft, but because it's incredibly inflammatory, the only thing a baby should be consuming is milk and meat/fat. I think that the inflammatory diet of babies is what's causing nasal congestion, as well as a poorly ventilated house that re-circulates stale and allergen filled air. There's a correlation between the rise in malocclusion and the switch to agriculture not because of the toughness of the diet, rather the increase of settlements (from caves to houses), and the decrease in health, increase of illness and nasal congestion from a nutritionally poor and inflammatory diet.