well, my daughter has a mild case of microcephaly.
Also colobomas (blind spots) in both eyes.
And she has learning difficulties (dyslexia and dyscalculia) and emotional regulation issues.
I don't know why, it could have been due to getting ill while I was pregnant with her, I got pretty sick in the first trimester. (At least the microcephaly and colobomas could be - the learning difficulties might be from neurodiversity genes).
But she does OK, you wouldn't know she had any issues when talking to her.