These baby garment extenders are a great idea for my baby. She is big for her age, and already wears size 12 months even though she isn't even 5 months old yet. If I didn't have these, she would be outgrowing all her onesies even faster, than before. But be careful,  hey don't fit all garments. They said they fit most on the site, but I have found several brands they do not work with.