You haven't asked, but I have picked up on some. There's the random shriek that's usually gas.

There's the single cries that are also usually air related, but probably comes out as burps.

There's the pain or shocked cry.

There's the constant/increasing in intensity cry if he doesn't get food fast enough.

I can tell the difference between these, but I think that's only 4. What would the 5 be?