A little period can make a such a big difference! I had some problems with the diapers to. I used Carter's from Walmart. My embroidery machine didn't like the fleece padding at all, I lost track of the number of needles I broke. Trying to figure out what the problem was, I took one of the diapers apart, what was in the center looked like quilters' fleece. Sometimes, the needles would break trying to go through the layers and would break off on the surface.
I think if I get asked again to make the burp pads and they want the thick pads, I will buy the diaper fabric, do the embroidery; then add the fleece padding, fold and stitch the fleece in place. Chris