As you can see, not nearly as traumatic as I had feared. Sam screamed once and then fell asleep on dad's shoulder. Whew!
His stats are currently: 23.5 inches (50th percentile), 13.5 pounds (75th percentile) and head is 16.1 inches (66th percentile). He doesn't weigh as much as we had expected (feared?) so we're feeling really great about his progress and the doctor seemed pleased.