Do cats must be vaccinated? My cat has been three months old, and because I have never had a vaccine before, so I do n’t know if I have to fight this time?

My birthday, the kitten at home ate a lot of cream, I don't know if there is nothing; I heard that the puppy couldn't eat cream, chocolate, etc., but I do n’t know if the kitten can be. Will it die if you eat it?