Hi there,
I'm on my second baby currently 4 weeks old. Just wanted to add (as you seem to feel like you're feeding all the time!) - yes, they do feed a lot at first but quite often, when they do the rooting thing (banging their head on your chest looking for a nipple/teat) it can also mean they've got wind so you could be right about the gas. So if you've just fed and you feel like DS can't really be hungry, try giving him a really good wind to see if that helps.