B.
I have a 2 year old girl and a 1 year old that are the same exact way and almost the same weights! The only probably is that now the one year old has learned how to lay on top of my two year old to make her scream. Since she's so heavy, my oldest daughter can't get out from under her. I really would not worry about it. It's just how my daughters are and my oldest one goes through phases of eating but she's healthy and happy. My youngest one never goes through a stage of not eating. One thing to try is to maybe let him help you cook the food in the kitchen. If he feels he made it, he would probably be more willing to eat some of it.