The idea of these is great. They could easily be better designed! It says on the packaging suitable up to 9 months... my daughter wore these at 3 months and I took them straight off, they are dangerous. They are FAR too tight and my daughter is by no means your average plump little baby, she is a very slim baby. They dug in and her little feet bulged out around them. To make matters worse they are so poorly made they simply consist of one piece of material joined together by a massive internal seam, which just digs in all the more. They cut in especially on the top of my baby's foot and would crinkle right up and fold under in the crease of her foot. They left terrible marks even just a short while wearing them and as so tight created sock pattern indents too, which I know hurt as I had sock indents towards the end of my pregnancy! Anyone who says these are good obviously does not care about their baby's feet! As previously said, my daughter had very small, slim feet at three months, so most babies would have bigger feet. I only hope nobody would ever, ever use these on a 9 month old baby as recommended!!!!!!!!!! These would be fab if larger and without the stupid inside seam. Better quality items would never have this sort of seam on them.