thanks!
we did go to the dr. she said it might be either lactose intolerance or reflux
so, for now we'er trying lactose free formula and adding cornflour.
he still cries, so i'm giving it 2 more days and we'll go back to the Dr. on Friday.
i have a feeling that the cornflour makes him full too early, so he's eating less (and it's hot here now... very hot, and the a/c dries) so i gave him just now a bottle with only the lactose free formula, but with the smallest nipple, and he ate a good amount w/o crying at all, maybe that's the answer... we'll keep trying.
thanks again!