We came back from the developmental pediatrician yesterday in a jubilant mood. Two of my sons came to us with significant developmental delays. Both of them have made wonderful progress, so last night was an occasion for celebration.

A lot of parents have children who are delayed in some ways. Some kids catch up. Some catch up part of the way. Some never do. It can be a huge struggle to trust that you are doing things “right.” After almost 16 years of parenting kids with significant disabili...