New to the forum and new to maine coon bellies

[Catlover]

Hi everyone
I am an experienced moggie owner but have never owned a Maine Coon before and took my new boy home on wednesday last week. He's an absolutely gorgeous 2 year old neutered male silver tabby and incredibly friendly and playful (He's making a great old mess with a toilet roll at the moment!). He does however feel a little thin to me (spine and ribs really easily felt). I took him to the vet and she agreed that he felt a little thin but she said he was of a normal weight (4.5kg). But I'm not sure if she meant normal for a regular sized cat and she didn't seem to know or believe that Maine coons can develop until they are 4. If people could give me an idea of what weight they think he should be that would be fantastic (I'll try to measure his length and update this post).

I would like some advice on how best to get him to a decent weight for his size. He came from a family with a lot of dogs and children and I don't think he got much peace to eat his food so I am hoping that he will naturally just fatten up. He had some runny stools when he first arrived but they are now firming up so I am putting that down to the stress of the move. The vet gave him a prebiotic to put on his food and I am sticking to giving him mainly dry food at the mo. He arrived with a bag of what I assume is whiskas dry food (fish shaped pieces) but he didn't seem to like it much and seemed to be addicted to whiskas pouches.

I've switched him to Royal canin maine coon which I am feeding ad libitum plus one whiskas pouch per day. I am also giving him a little kitten milk every day. Does this sound ok until he has gained a bit of condition? I've wormed him with some of the drops you put on the neck however I am not convinced that all of it went on his skin- would I expect to see worms in his stools if he has worms? Any other advice gratefully received.

Another question, which is slightly off topic for this thread is- should he have curly belly hair?! He apparently never got groomed at his last house and he really doesn't seem to like the brush but I will persevere- should his belly hair look as smooth as his other hair?

Thanks, and sorry for the length of this post!
Alison