8-10 insects a day is underfeeding... even 30 insects a day is a bit low for a baby of that age, I'd say at least 60 bugs a day if not more.
Beardies are really expensive pets to feed as they need a large number of insects daily when they're young and they must be live insects as well not freeze-dried or canned.
A good thing to do is every feeding feed him as much as he wants in a 10-15 minute time frame. Also if possible I'd suggest bumping it up to 3 feedings a day as two feedings is a bit low for a beardie that young.
When my beardies were in the 1-4 month old age range they ate one feeding at about 7-8 AM, the second feeding at 11 or 3 PM depending on what was going on and then a third feeding at 6 PM.
Each feeding being 20-30 insects at the very least.
This feeding guide should help out.
1-4 months 3x a day.
4-12 months 2x a day.
<<< I believe is best to give 2x to 3x per day if practical, as many live insects as they want, up til 6 months old , then 2x per day til about 12 months old.
12-20 months once a day.
20+ months twice a week at the least, every other day at the most.
<< I give some live insects each day to my adults , ie a couple large silkworms + maybe 8 - 10 Lg crickets + salad offered too.
Staple feeders - Crickets, locusts, grasshoppers, silkworms, black soldier fly larvae, dubia roaches, turkish roaches.
Treat feeders - Waxworms, hornworms, superworms, mealworms, butterworms.
Wax worms - once a week, 4-5 max.
Hornworms - every other day to every two days, 4-6 max.
Mealworms - every other day to every two days, 5-10 max. Only for beardies above 6 months.
Superworms - once or twice a week, 3-4 max. Only for beardies above 12 months.
Butterworms - once or twice a week, 3-4 max.
Daily greens- Turnip/collard/mustard greens, endive, and kale if added to a mixture of the other staple greens mentioned.
Fruit once or twice a week - Banana, strawberries, blueberries, blackberries, red raspberries.
For more food items -
http://www.thebeardeddragon.org/bearded-dragon-diet.php
http://www.beautifuldragons.com/Nutrition.html
Supplementation -
You want two supplements at the very least, a calcium and a multivitamin.
The supplements should be lightly dusted on all bugs.
Generally, beardies below two years need calcium 5x a week and multivitamins 2x a week.
However, beardies above two years or at two years of age need calcium only 2-4x a week with multivitamins 1-2x a week.
This does depend on how your beardie is with diet, health, just laid eggs, is laying eggs, etc.