It was the first real day of kindergarten, and the rain was pouring down. Our original plan was to walk to school, and I’d escort my proud newbie to his class. But instead, I announced that they would be dropped off in carpool and walk in together. There were no tears, no waves over the shoulder, just an efficient evacuation out the back door and heads-down determination not to get too wet. When I pulled into the garage back home, I was hit by a twinge of mommy guilt and drove back to school to go in and give my baby boy a hug. He was sitting at the table…