Have you rescued or adopted before? Persians and Himalayan cats and kittens require a lot of hair grooming.I have had all and they were the best cats ever!!! A mix may be best for you because the Siamese have short hair and are easy to groom.
Aug 23, 2013
Doctor visit by: My2wins
My guess would be that either he has a medical condition that needs to be looked at, or possibly he hasn't learned how to clean himself, which can happen in kittens who were removed from their mama too soon. She wipes the kittens and they learn the routine from her.
There are anal sacs that can be extremely odorful if cats don't regularly groom.
I'd start with a vet visit. And if the vet approves you might want to help him out with warm wet wipes (water only). I did this with my Siamese kittens when they were little and stinky and they figured it out in a few months. Haven't smelled anything from them in over a year maybe more. Hope this helps.