Dave, I don't know what to tell you other than what everyone previously stated. I do think they should be larger. Mine are 3 yrs old and are 8, 10, 12 inches approx. Although each varies in size, they have been growing noticeably. Slow growth is best to avoid shell problems. So, just make sure they are receiving a good diet and proper lighting!

Don't Sulcatas get really big? Like the type you can see in zoo's?

Yes they do get big. Males grow up to 30" and reach weights of over 120 pounds. Females reach 20 to 24" and weigh from 65 to 75 pounds.

Some you see in Zoos are Galapagos tortoises (largest) or Aldabras (2nd largest) these get really big, but Sulcatas are considered the 3rd largest, I believe.

Dave: They still look like brand new hatchlings to me. I think they should have changed quite a bit in a year and a half, and started to look more like sulcatas.

Take a look at the sites that Anja referred you to and make sure you are giving them the right kinds of foods. Also, they need to be kept warm and hydrated. At that size, and in an indoor habitat under lights, they are essentially on "slow-cook." Even if you keep your substrate slightly moist, they dry out quickly under the lights, so you need to soak them AT LEAST every other day, but daily would not be too often. For at least 15 minutes each time.

Yvonne

They must all grow at different rates. I have two Sulcatas, one is 9 months old and 4 1/2 inches, the other is about 5 months old and 2 3/4 inches. The little one doesn't seem to be growing as fast as the oldest did, but they are both eating.

As was said, they grow at different rates. My friend & I each got a hatchling the same day from the same clutch. Hers stayed tiny for ever. She worked with me at the vet hospital. The vet & I teased her cause at 9 months mine was nearly twice the size of hers. Then I didn't see hers for about 6 months. By then it had nearly caught up with mine. Don't worry as long as you are feeding properly, dusting with calcium, & have the proper heat & UVB light. I don't think you said if you have a UVB. If so what brand & number is it? Is it a fluorescent tube? Are you checking temps with a temp gun or digital with a wire with a probe on the end? You can get the digital one with the probe that also reads humidity at Walmart for $12.
Patsy