Babies need a diet of almost all protein...offering greens is great but protein should be about 90% of their diet until they are adults when that reverses--adults 80-90% greens 10-20% protein. I'd suggest that you slowly reduce and eliminate romaine from the salad. Mist or soak your baby daily to keep him hydrated. If you mist make sure the tank does not get too wet as you do not need that much humidity.
Babies grow fast and need the protein to thrive. If you can get your baby to eat pellets with his salad you can reduce the amount of crickets--but 6-8 crickets a day is not enough!
Offer all the crickets your baby can eat in 5-10 minutes two to three times a day. Offer the veggies all of the time. A healthy baby will eat 25-100 crickets a day!
You will most likely find that it is much cheaper to purchase your crickets online. When ours was a baby I ordered 1/4 inch crickets---slightly larger than pinheads. 1000 lasted 4-6 weeks before they got too big (feed no larger than the space between their eyes to prevent choking). I paid an average of $15 for 1000 (postage paid)--much cheaper than the pet shop!
Now our beardies are adults I only feed crickets as a treat...I have a silkworm colony established and hatch out a few every week or so...both of our dragons prefer their worms!
Good luck with your baby...
What kind of a set up do you have...size, temperatures, lighting?