I think it varies but the first ones to try eliminating from your diet would be beans, broccoli, cauliflower, etc. I saw a short list recently but don't remember all of it. My LO gets gas but I think it's mostly from swallowig air - he is hard to burp, so often we can't get it out of him and he's in pain later. Today is the first day we are trying mylicon.
onions, cabbage, anything that gives you gas. Try Gripe Water...liquid drops to help settle babies tummy. It is a mix of ginger, fennel and other herbs...really fast acting. Great for hiccups too!
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dairy was the main thing my doc said to stay away from. also the other things listed (broccoli, carbonation, etc)... you can check kellymom.com for other tips.
Re: Help-Need a reminder:what gives breastfed babies gas?