I am saying it’s possible there’s a gut-brain axis being affected by any number of factors. Consider Caesarian babies. I didn’t look it up, but I think since Caesarian babies aren’t exposed to bacteria from the vaginal canal, it perhaps contributes to their condition.

It's technically possible that early-life microbiome differences from bypassing the birth canal could influence it, but the fact that the association disappears when siblings who were delivered differently are compared is suggestive.

"However, the association did not persist when using sibling controls, implying that this association is due to familial confounding by genetic and/or environmental factors." - https://jamanetwork.com/journals/jamapsychiatry/fullarticle/...