Before we ever tried to have children, my husband and I had the conversations most couples hope they’ll never need. We talked about genetics, about chromosomal conditions, about what we would do if a pregnancy showed something was seriously wrong. I’m a paediatric nurse, so I’ve seen firsthand the lifelong impact severe disability can have — not just on the child, but on parents, siblings, marriages, and mental health. We knew, quietly but clearly, what our boundaries were. It might sound...