I agree with the other posters here. Let them grow up a bit and concentrate on eating their chick feed. In a couple weeks you can start with some tiny treats. Make sure to add grit to their diet when you do start to add other things.
Welcome to the BYC flock- I wouldn't rush them - once you start feeding treats it can get out of hand - then the chicks will turn up their beaks at their nutritional feed. The will act like kids with candy.