Four months old

Cadel had his four-month check-up on Monday.  He is growing and doing beautifully.  He now weighs 16 lbs. 2.2 oz. (50-75%) and is 26 inches long (slightly above 75%). I forgot his head circumference measurement but it was also 75%.  I like to refer to him as our runt since he seems so small compared to his older brothers at the same ages (they were both 2 pounds heavier).  Cadel is so calm and content.  He loves watching his brothers in action.  He also likes rolling over and trying to figure out how to get moving.  He doesn't have any teeth yet but drools constantly.  He smiles at everyone.