1 week check-up

Alden is doing great and at his 1 week appointment yesterday, he was back to his birth weight (9lbs. 9oz.). His height is now 21.5" which is curious to me since he was supposedly only 20" at birth. Obviously he didn't grow 1.5" in one week, but I wonder if the discrepancy is human-error or just the fact that babies stretch out after birth. Either way, it feels good to know that he is growing and healthy.