What size do you want the finished baby quilt to be? What size are you thinking of for the sashing, 2" (finished)? Are you also planning on boarders?
With the 9 blocks, I would assume that you will lay it out 3x3 (3 across and 3 down). So far that makes it 18 (unfinished).
More information would help. Plus if you have pictures of you applique blocks would be nice.