I am convinced some kids just have a more sensitive sense of taste or just like less chewy foods so in effect are born fussy.
I have non identical twins and a dd with a 15 month old gap. DP and I adore food, I spent my early years abroad and ate the local food off street markets and have always eaten anything and everything, my sister on the other hand was a nightmare from day one. Dp was the same fab eater from day one his sister a nightmare. Both subsequently became veggie as they just never liked eating meat.
Now my twins were weaned on exactly the same food, I bombarded them with new tastes from day one. As dp and I love exotic foods(pretty much any food actually) we always said we would never tolerate a fussy eater!!!!!! Errrrm one of our twins has always been fussy from day one,he used to filter out baby rice and wouldn't eat food he didn't like.
As we bombarded them it hasn't been too much of a problem as he has quite a wide healthy diet. He detests veg except peas, and corn (doesn't like trying anything new) but adores fruit,lentils,beans,humus,meat,mature cheddar,yog his familiar foods etc.
The other two dc have eaten anything and everything from day one and are sooooo easy to feed. They eat things with really strong tastes like olives,cabbage etc and will try every new thing I give them. My other twin on the other hand doesn't like anything too salty or sweet,anything extreme the blander the better.
We've always eaten together,the same food,if they don't eat it they go hungry but I never force anything on them and never stress about it so there is really no reason for ds to be different from the other two other than he was born like it.
He has quite conservative tastes in everything else too and just likes what he likes whether it be his favourite shoes,books etc. Each to their own.
I'm presuming this baby is your 1st child as you won't have gone through the various food stages. They can all get fussier around 2 and improve around 41/2 well all my 3 have in different degrees as have a lot of most of their friends so I wouldn't be too complacent. There is still time yet for you to have a toddler who only eats enough to fill a bird