Is this Chance that you are talking about? It's very difficult to compare development just using pictures. A better guide is the weight chart on the Kitten Rescue web site that I gave you (www.kitten-rescue.com) He should be gaining between 10 and 20 grams a day.
Kitten Weight
At birth, weight should be approx 3-3.4 ounces.
At age 1 week weight should be approx. 4 ounces.
At age 2 weeks, weight should be approx. 7 ounces.
At age 3 weeks, weight should be approx. 10 ounces.
At age 4 weeks weight should be approx. 13 ounces.
At age 5 weeks, weight should be approximately 1 pound.
By the end of the 8th week, kittens should weigh approximately 2.2 pounds.