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My guess is food isn't so sterile (lack of probiotic and other micro-life) food in South America, Asia, etc [yet]. Same for water, environment in general. Plus more human to human contact. So effects of antibiotics are constantly being reversed. Plus lactobacillus tablets are literally taken with the antibiotics (tho probably it should be taken a week after a round of antibiotics?).

Whereas some Western countries might have a sterile-ness + formula + meds + other environmental factors that form the perfect storm. Edit: I'm not saying it causes x or y. Just that it is not ideal for a young kid.

I dont have any proof either way, but you're assuming it's the only factor. It could be a mix of antibiotic and diet, or antibiotic and lack of exposure to other germs.

Could also be that all bacteria evolved to resist the OTC antibiotics in that environment.

Thanks, really great anecdote for US centric folks.