I should have asked....what size tank is he in and how are you measuring the temps ? If it's a 40 gal. tank the 100 watt bulb may not be getting the tank warm enough. The basking spot should be about 105, the cool side about 80, and the rest of the tank in between those temp.
Are you offering food 2-3X a day ? That gives him a chance to eat more often. You say the crickets are small ? That's good, the recommended size for baby dragons is no longer than the length between their eyes. You can also try Phoenix worms, most beardies love them. The majority of veggies to feed a dragon will be greens.....these include turnip greens, mustard greens, collard greens, dandelion, cilantro....and these can be torn in to bite sized pieces. Any other veggies, like squash, should be finely grated and carrots are not really good for beardies so you can skip those or just a few tiny but finely grated pieces mixed with the greens. Only a small amount of greens is necessary for a baby beardie. All my dragons ate greens as babies but some beardies aren't given them by the breeders and stores so some babies don't show much interest in them but you can still offer them and hope to get him to eat some.