Thanks for answering so quick!!
Now I don't need to cast on a sleeve for something to do while waiting for an answer! It just seemed odd to me that it would tell me to purl across a row that should be p4, k2, and to maintain a pattern in a row that's simply knit across!
Basically the ribbing pattern is a 4/2 ribbing, but the "rib" part is actually garter stitch. Clear as mud? It's turning out really cute in the RH Kids I bought, but I won't ever use that stuff again! I'm hoping to have a pic of Alex wearing it posted soon... every time he looks at it, he asks me if it's done!