She Made Every Effort to Avoid COVID-19 While Pregnant. Not a Single Thing Went According to Plan.

Last September, over pancakes at a diner in central Massachusetts, Molly Baldwin told her husband, Jonathan, they were going to have a baby. He cried into his coffee mug, elated and a little surprised. They had only been trying for about a week, and they had yearned for a summer baby, ideally in June, which would enable their parents to spend more time with their first grandchild.

“We thought we had the best timing,” she said.

But as the novel coronavirus began to spread through the country this year, Baldwin...