Just before my son’s 9-month checkup, my wife and I debated whether to postpone it. It was a “well baby visit,” but the potential threats to his health felt real. The last time he went to the pediatrician, in November, the air inside the office was stuffy, and the waiting room was crowded with children from schools in and around St. Louis, all waiting to get their covid shots. By showing up to get their children vaccinated, the families were all following the guidance from the Centers for Disease Control and Prevention for children ages 5 to 11. But we were trying to follow the CDC guidance to…