My Lizzie (Rainbow Bridge) would upchuck constantly after eating. She was always ravenous though and never lost her appetite. The vets' could never diagnose anything amiss though. I would definietely take your baby to the vet, just to ease your mind. Hope fully Snow Tiger just has an upset belly! Could be something as simple as something he ate, furballs, constipation....Please let us know how he's doing. What a beautiful name for your baby