I think its just a small risk, like it doesnt happen often, but because its been documented to happen and somehow linked to zofran they have to let people know somehow
I took zofran wth both my babies for extreme morning sickness. One is 2 years old and the other is 12 weeks, both fine and healthy!
I took zofran in the beginning and my baby is just fine :)
I've been taking it everyday since I was 10 weeks, I'm now 38+4 weeks and my baby doesn't have it. They can detect that in the ultrasound, ask them to look for it.