thank you very much for the comment. I have twin boys and they are fraternal and nothing alike.
I wouldn't be too concerned. Children do go through these spouts now and then. I'm a mother of two. I have one children that is a great eater and another that is also a great eater but not gaining weight. If it's something that goes on you can always take your baby to his pediatrician. I'm sure he's fine though :o)
His feeding and sleeping patterns may also be in transition.
Best wishes!!
Heather