I was very unprepared for his concern regarding Hudson's size. Very.
First the good news. The doctor is fairly certain it is not a hormone issue. He is still running the bloodwork to be sure, but he's not worried about it.
He is fairly certain that it's a calorie issue. Either Hudson is a) not consuming enough calories for his activity level or b) his body is not processing the calories he is eating.
At this point, the doctor is completing his panel of blood tests, including celiac disease; we are being referred to a GI specialist; and Hudson gets a high-fat bedtime snack every night. (Its a tough job, but someone has to do it.)
We should have bloodwork results in 2 weeks and we'll keep you posted. Thanks everyone!