embroidery bonanza

so, on my embroidery kick lately, i decided to pick up some simple white onesies and add some embellishments for little patootie (my current nickname for my sister's baby). so far i'm pretty pleased with how they have come out--2 down, 3 to go! now i just have to figure out how to finish off the back so the stitching doesn't irritate any tummies. i read about some finishing product you can put on the back...i'm hoping my sister's mother-in-law will be able to lend some insight...