Some parents-to-be start with tiny clothes, others with more practical purchases. My shopping spree began with a whirligig.

My husband and I were on our belated honeymoon, road-tripping through the United States. Already we were three, as my jumping 28-week-old bump confirmed. Who was in there? we wondered, driving from New York to New Orleans down the never-ending crests of the Appalachian Mountains. We stopped to swim in ancient rivers and picnic beside trees with curving trunks, which were shaped by Native Americans to mark out the path ahead.