I'd look mainly at how it fits. Young children's proportions are so much different than adults. Also, in the picture you'll notice that the shoulder seam drops down a bit over the arm, so the actual fit of the sweater will be different than how it appears when you lay it out.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry