I think it's sad that so many people fall for the "natural is always good" fallacy.
We evolved away from "natural" behaviour so long ago that you can see it in the structure of our bodies.
When we were scavangers, we ate what we could find. Thus the only food may well have been roots or tough meat that's hard for a yound humanoid to eat. Parental chewing would have been necessary for survival.
In any case the UNICEF issue is with kids in shit countries. In that environment, you must work hard to stop the baby being exposed to tainted food. Purees go off very quickly and are expensive.
Bottled foods that I see in shops are pretty awful. Because they pander to the high expectations, but low educational standards of many mothers they contain serious amounts of junk, just with misleading lables for those who sat giggling with their friends at the back of science classes.
We see "sea salt" and "organic sugar", and know for a fact that this fools dimwitted consumers else the makers would go out of business.
I'm always entertained that these products are "GM free", but contain enough conventional poisons to be used in chemical warfare.
We made our own purees for the kids.