Well, if you look under the frills, they have a skinnier neck. They can choke down bigger ones but try to stay within the diameter of their necks. Babies should be on the small crickets but they graduate to medium pretty fast.
:I have two baby frilled dragons and I was curious what size crickets to feed them. They are not new borns. They are a pretty big size so what is a good rule to follow... nothing bigger than their heads? Just curious