You will need to go out and buy or order more pinhead - 1/4 inch crickets to feed him. You can keep them alive by feeding the crickets (keep them in a shoe box type container with a screen cover, just stable aluminum screen over a hole cut into the lid). Feed the crickets mixed greens and vegetables (basically the same greens you would feed your dragon) plus fish flakes, crushed dried low fat catfood (no dyes if possible) or skimmilk powder or a combination of the above. For moisture, offer slices of orange, potato, carrots or squash. Change greens and wet foods daily, dry foods can be changed whenever it looks full of cricket poop. The only other thing you need in the cricket bin is lots of egg crate (the paper kind) or similiar. (ie coffee cup holders, toilette paper tubes, scrunched up newspaper etc). Y ou can get large egg flats (crates) from most breakfast nooks or cafetarias, just ask the workers to keep some for you. This is where i get my stock. Once I have 10-20 flats, I stop collecting them as this lasts me for a long time.
If the crickets you do have are not fully winged...you can snip them in half and feed the halves to your bearded dragon (remove the large legs though). Other foods you can offer are small silkworms (half inch ones are ideal, even if they are larger than the between the eye distance rule. Silkworms are very soft bodied and are less likely to cause impaction or pressure on the lower spine. Just don't feed them too much. A silkworm is easily the same bulk and nutrition as 3-5 crickets.
Mealworms can be risky for bearded dragons, especially young ones, for the reasons already mentioned. However, if you have newly molted mealies, you can offer a couple of those (they will be very pale to white in color).
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PHLdyPayne