I've pondered the posts from far-more-experienced/brave knitters than I concerning the sleeves for Bella being done in the round. I've read EZ's (Zimmerman--Knitting Without Tears) wise words more times than I can count, just could not get my pokey ol' brain in gear to understand short rows and tubular knitting. Apparently, I'm not the only person wondering about this.
So, I've done a little research (ah, the internet!) and have come up with a couple of articles from knitty.com that may be of good help in learning how to do a cap sleeve that's knit from the shoulder down without seams: