You could try to contact Royal Canin - if they have a special dry food for this particular breed. I know they do Siamese, Persians and Maine Coon food. Check your baby's spine - with normal weight it should not have bones sticking out; but if you can feel them - take him to the Vets for a check up. If Vet wont find anything wrong, try to indulge him (I mean kitten) for a while with shrimps, meat or fresh fish just to stretch his stomack and to make eating bigger quontities a habbit. Also you could ask the person who bred him - what they used to feed your baby before, may be they know his favorite food? You might fing a nice frozen fish in many Pet shops.
Elena
www.terzovia.com
« You become responsible, forever, for what you have tamed.»
(Little Prince,A.de Saint Exupery)