I did a Sunbonnet Sue baby quilt -- the pattern finished size was 28" X 36". I decided that was too small. I took the pattern pieces to the copy machine, enlarged the pieces by 50% and then doubled the blocks. I came out with a 45 X 60 Crib size quilt. And, this was the first quilt I had ever made. It turned out great! Your pattern is adorable. Good luck with it. If you want to enlarge the pattern pieces, just make sure each piece is enlarged by the same percentages and you shouldn't have any problems!
Jeanette Frantz