Help with young kitten

Question
I'd like to say that I really am glad you all are here first, I am really worried and the last site like this wanted me to pay to get an answer :(

My kitty is about 3-5 weeks old & orphaned, and he seems to be bloated to me.  He is very fat, and walks a lil funny.  He seems to be pooping & peeing though, & we have given him a small amount of corn syrup to try to encourage pooping.  We are worried it is gas buildup, and the only thing we can think of is if he poops, hopefully the gas will go out too.

We were feeding him an infant human formula until recently when we discovered infant kitty formula.  

Answer
As long as he's pooping at least once every 24-48 hours, I wouldn't be too worried about gas.  However, beware of constipation.  Human formula contains much too much iron for kittens and can cause blockages from constipation.  Even kitten formula causes constipation in many of my orphans.

Kittens this age who have bloated bellies are very often suffering roundworm infestations, which are passed to them at birth through their mother's breast milk.  These are parasitic worms that live in the gastrointestinal tract.  They become so numerous that they cause a big pot belly.  And they can also cause gas, diarrhea, vomiting and malnutrition.  Any kitten suspected of having roundworms should be treated with a medication to kill the worms.  Certain treatments are safe to give even to very young kittens, but the best medications from the vet.  DO NOT use piperazine products on a kitten this young (look on the label of the wormer to see if it contains dipiperazine sulfate or piperazine citrate).  In fact, I don't recommend any piperazine products because I find piperazine citrate doesn't work, and I've heard of a few cases where dipiperazine sulfate has killed kittens.  SO, I only feel comfortable recommending products containing pyrantel pamoate.  However, those available at pet stores have to be given in massive dosages, and I find THAT causes vomiting!  A vet is the best place to obtain worming medications.

There are less common possibilities like a rather rare disease called FIP, which can cause fluid to build up in the abdomen and cause bloating.  This is, unfortunately, always fatal.  However, as mentioned, it's quite rare and only infects .5-2% of all cats.

Sometimes problems with the kidneys or other organs will cause fluid buildup, too.  Best idea is to get him to a vet ASAP.