Hi, welcome to quilting. I read somewhere that because baby quilts will probably be washed more than others, it might be preferrable to tie. I tied the 2 baby quilts I made, with embroidery floss like Purple Passion suggested, and they turned out great. I thought floss was easier to match to the colors of the quilt. I used 6 strands.The parents of the babies were very happy with them. Good luck and stay in touch.
Julie