DS is 19 months, and has gone from an eat-anything-put-in-front-of-him baby, to a toddler who says "yuck!" and spits out most vegetables. 
He also won't drink milk or eat cheese, except in cheese sauce or cheese spread.
He eats loads of fruit and yoghurt, and otherwise has a varied diet, though carbs do feature pretty heavily, and I think he would live entirely on toast, yoghurt and bananas if he could. I'm determined not to get into a battle over food, my brother was the fussiest eater imaginable as a child and now eats literally anything and considers himself a bit of a gourmet, so I know they usually grow out of it. But I do worry about his vitamin and calcium intake.
Are there any good multivitamins recommended for younger toddlers? I think it would have to be something that tastes nice. Any other suggestions, other than blending veg into pasta sauce etc, making custards/rice puddings with milk etc?