Maybe its just a stage Kat? I know Miss M goes through stages where she skulls heaps and then somedays she's just not that interested!!!!!

I'd say give it a couple of days and if you are worried - pop down to the GP and get him checked out. He's not coming down with a cold or anything? Sometimes that can put them off their food.. I know you said he isn't sick - but maybe he's coming down with it?

If he is still gaining weight and plenty of wet and pooped up nappies - I wouldn't be too worried.. he's just taking what he needs.