I would make about 6 baby quilts, in a mixture of colors and fabrics. Keep track of your time and money. You can then mark them up for sale for baby gifts, but it will give you an idea of the time and cost of each. You can take pictures of the quilts for an album to show potential buyers, and talk to the about fabric- they supply the fabric (you will know the yardage each takes), or the price if you supply the fabric.
Another idea that I have seen, is that a quilt is made up of blocks, where the baby's outgrown onesies, little outfits are machine appliqued on the blocks, with simple 9 patch blocks interspersed. Looks nice, and is a great remembrance. Congratulations on your new endeavor, it sounds like you have a niche market going for you!!