really fussy eater

[jimssteph21]

Hi there!
I am having food problems with my DS2 (almost 3yrs). He is very fussy. I am wondering if these foods are enough for him.

yoghurt (only plain, any fruit he gags)
weetbix (but only the little ones he can eat with his fingers)
honey sandwiches or toast (sometimes he'll have smooth peanut butter)
some dried fruit (I limit because of the sugar content)
arrowroot biscuits
noodles
cheese (sometimes he will eat it)
custard
chicken or fish nuggets

I give him toddler milk because I am worried he isn't getting enough nutrients. He is a good weight I think @ 16kg and about 100cms in height. I don't understand why he is so fussy eating - he used to be great with food, eating a wide variety of vegetables, fruits and meats. Now he refuses all of these foods. I tried mashing up his weetbix and mixing some banana through and he could smell the banana and he gagged. He gags when veges or fruit are placed in front of him at meal times. I have DS1 (4yrs) and DS3 (almost 2yrs) who are fabulous eaters but DS2 never follows their examples. Lately he seems to be looking at their food with interest even though he has refused the same food from his own plate. Has any one got any good tips on disguising foods or recipes that have worked with other fussy eaters? The tips I have gotten from health nurses have been useless.