A woman on my local facebook is selling new prepped buy never used blue edged osocozy prefolds she got as a gift. She says that they are 11x15 after prepping. The only blue ones by osocozy i can find have different dimensions and they say they are meant for trifolding. Has anyone used them and had luck with using a snappy? I was hoping to add these to my newborn stash but I don't want to trifold for a newborn.