It's funny, I've seen this before and my experience is the exact opposite. I've got 2 kids that were on what feels like a million antibiotics when they were you

It's funny, I've seen this before and my experience is the exact opposite. I've got 2 kids that were on what feels like a million antibiotics when they were young, one's thin, one's average. I've got a 3rd kid was NEVER on them at all, he's obese. I know this and other studies are population averages and all that, but it always surprises me when my experience is the exact opposite. Something to do with what gut microbes were killed or something?