My 9 day old puppy's stomach feels a little bloated, whimpers a lot, and breaths kind of funny?

He has a brother that we can compare to, and he is not having the same issues. The puppy's tummy feels a little bloated, it squeaks more than whimpers (it acts like its in discomfort). The breathing is fast and kind of forced as if you felt too full to breath so its taking short quick breaths. It has moments when it is calm and sleeps, but then will start crawling aimlessly and making that whining sound. There are no other physical signs of issues, it looks healthy, eats, and doesn't seem to be at a loss of energy. It has always been a little whiny but it seems to be getting obvous that something is wrong. I've talked to the vet, and we plan to take him in the morning if things dont get better. Does anyone know of things that we can try to find out what is wrong, or to solve the problem? Our guesses are; bloated from eating too much too fast, colic, something to do with worms (we've heard), or constipation. PLEASE HELP!