The window of treatability for genetic conditions like Fragile X syndrome is unknown and may require intervention before birth.

“what's unknown um and I think one of the things we don't know until we do it in people is what is that window of treatability ... is that window even if Guardian worked perfectly and we could identify these babies with this within the first week of life um is that early enough U of course my hope is that for many conditions that will be um it's possible that we'll need to go even earlier and so there are some people that have thought about even in utero gene therapy or genetic treatments for some conditions not all of them but for some conditions where it might be necessary to get even during development fetal development to have the maximal effect”