It might be too late for today's babies, but if you could build a big enough catalog of mutations and suspected/confirmed ill effects, then you'd potentially be able to catch thousands of these mutations essentially at conception and supply a custom therapy right then and there to correct it before any brain development has begun at all.
Lydia's father here. If I wasn't fighting this fight, my fight would be to push for prenatal exome sequencing. I acknowledge it's not as black and white -- there are some ethical concerns about how to process the data, but give the parents the choice.
Most people don’t even know when they conceive. A significant number of pregnancies end in miscarriage without the woman ever knowing. Lack of a catalog of issues is only the first obstacle to any kind of “correction at conception”.
