One theory I like is: Gut-Brain connection. Gut composition signals to brain.
If a child took antibiotics the gut loses its balances, this has to be rebuild with the right food.
If this dysbalance stays long enough it can affect the development of the brain. I’m not saying it’s damage mkay.
What supports this hypothesis is that gut-brain mechanism is insanely underexplored.
(English 2nd etc)