If the sweater still rolls after blocking, you can pick up stitches along the bottom, and knit a hem. Just pick up one stitch in each stitch with the work facing you, knit or purl a row (for stockinette stitch facing out), and then decrease 1 stitch out of ten in the following row (work 8 stitches, k2tog, repeat). Then knit plain stockinette for an inch or so, and sew it stitch for stitch to the purl loops on the inside of the sweater. The baby bees sweater I have on the patterns page was edged this way along the bottom. It's also a fun opportunity to knit a hidden design, like the child's name, into the hem, like Elizabeth Zimmerman used to do. Just chart out the letters on graph paper. Fun!
KnittingHelp Queen Bee
"Don't ask yourself what the world needs. Ask yourself what makes you come alive and then go do that. Because what the world needs is people who have come alive." Howard Thurman