Do they have a low sodium version?
Heat them up in the microwave for 20 seconds first, just to be on the safe side for bacteria that could harm your baby. And if it's the salt content you're worried about, drink lots of water? I really like v8 juice, and it seems to be the only thing that doesn't make me ill, but it has very high sodium content too. I think once in a while it's probably ok though.