I have several packs of these for my son and they have absolutely been worth it.  When my daughter was born a few weeks ago, she has the longest, skinniest feet I have ever seen on a kid.  These are the only things that will stay on her.  They actually seem kind of loose around her ankles, but they still do not fall off, which is great because it is winter and pretty chilly here in the Midwest.  I would recommend these to anyone.