I knitted this up for my little grandson. It's made of Bernat Baby Jacquards, and it's made from the top down. After it was done to the hem, and one arm was finished, I got a chance to put it on him. It didn't fit. So...I lengthened out the first sleeve by 3 inches, and the body length by 4 inches. I had to rip back to the start of the ribbing, but it wasn't too bad. I also eliminated the few decreases at the bottom edge before the ribbing starts. (somebody is plumping up). I think his body filled out the sweater more, which in turn shortened it. Anyhow, I'm pleased with it.