When we decided to have a second child, we'd ruled out every existing disorder that could possibly explain him. After consultation with our medical team, they

When we decided to have a second child, we'd ruled out every existing disorder that could possibly explain him. After consultation with our medical team, they concurred that a de novo mutation for Bertrand was a strong possibility. And, in truth, the conditional probability of de novo mutation for Bertrand was much higher than what actually happened--two independent mutations in the same gene colliding with one another. If we had known the probability for Victoria was 1/4, we never would have gotten pregnant. Ignorance was bliss.