Okay, I knew this would happen. Over night my baby became a very big boy.
As far as his new role as big brother, he's doing better each day. He would get sad every time I nursed the baby the first few days, but now Josh tells me to feed Sam if he get fussy. Luckily we've been blessed with a very mellow baby who doesn't do much crying, he's been so pleasant, and so very lovable! I think it'd take more of a toll on the rest of the kids if he were a really fussy, high maintenance little guy. So things are going well overall, but I know Josh well enough to know that he still doesn't quite feel settled with all of the changes that come with a new baby. I imagine that will fade with time.
But in the mean time, I can't deny that he does in fact enjoy being the "big brother" and does a good job at it!