After putting these on my 4 month old daughter twice, the stitching on one of the bottles came undone. (Note that my daughter cannot walk or crawl.) There is a loose thread that will unravel all the stitches connecting the sole to the top of the shoe if pulled.  So far, there's about a half inch unraveled--a large proportion of the length of the size one bootie.

Also, the bootie is very hard to get onto her foot.