Hi Biggins....mealies can easily cause impaction, but if you just feed the freshly shed ones [ they're almost creamy white ] they should be O.K. if they are small. Check around your pet stores for small crickets , but they must be no longer than the space between the beardies eyes. It's very important for a 4-5 inch dragon to eat very tiny prey items. You can order Phoenix worms on line, or check if any pet stores carry them, they are a better choice than waxworms. I hope you can get everything you need and that your baby does well !