This is Thor, our Maine Coon at various ages. He is currently about 18 months old and still growing. To answer your question, I would say that your kitten probably has some Maine Coon bloodline in it as he has the *look* of a Maine Coon.....at least to me he does.
Thor at 12 weeks
Thor at 9 months
Thor's face at 9 months
Maine Coon's can become very large cats, and from what I hear they are rather clumsy in nature.....Thor proves this to the tee
At 18 months old he weighs 16 lbs. and is still growing. Maine Coon's also have a very, for lack of better words, WIMPY meow. He has very large tufts of hair on the top point of each ear and it is so hard to trim his nails because of the hair that grows out the bottom of his toes, I believe that this also contributes to his *clumsyness* especially on slick surfaces. He is our resident clown. The Maine Coon breed also has longer hair around his neck and down his shoulders as well as back his side and hind legs, you can see this on the one picture. Another defining feature of this breed is the length and size of the tail. When he was still a kitten, his tail was longer than his whole body was....but not now. I hope this helps.......