Bucket, when they are first born they have egg yolk in their tummies to tide them over until they start eating.
Just put a couple of pinheads in with them each day and they will eventually start chasing them. Try not to leave the pinheads in there with them as the crickets can nibble on the beardies.
It can take up to 2 weeks for some.
I personally like to separate them into small tubs, on a hot mat with a uv light right over the top. The dominant feeders can get all the food, so is best to separate them.
Once you get them eating, feed them every day.Be careful that the crix are not to big for them. Crix as they get bigger have big back legs that can cause impaction in small beardies. Give them larger crix as they grow. I like to feed them in the afternoon/dinner time.