My experience so far with fusibles is that you have to stitch around the edge even if you use a heavier one. I use Heat-n-Bond Lite so that it's not so stiff and I just do a satin stitch around with my machine, or do a blanket stitch by hand. I picked up and used my regular Heat-n-Bond once and I'll never make that mistake again!! It was so stiff and sticky that it gummed up my needle, so I had to do it by hand which nearly ruined my fingers. It's sooo stiff and sticky. But even at that, I could see that it was starting to lift off the fabric in places and would never have withstood washing. Since you're making baby quilts that will get washed a lot, I'd just go ahead and do some kind of stitch around. You could do a primitive applique which is simply a straight stitch (by hand or machine) about 1/8" from the inside edge of the applque. It ravels a bit, but it can be charming.