I do, honestly. DD (17 months) is going through a picky stage and barely eats anything at the moment but when she does it fruit, fruit and more fruit. Yesterday she had grapes, kiwi, apple, orange, banana and a pear. And a few cornflakes for her breakfast. I offer her anything else she just says "No, No, No", points at the fruit bown and signs "more" really assertively.
So her diet at the moment is practically milk (she still has a lot) and fruit.
Should I be worried? I don't think so but you know when you have those moments....