Used from the newborn period until around 2 months old. Since my baby was born in winter, I used it over a short undergarment or a bodysuit-type undershirt. The snaps at the feet made it easy to use because the undershirt wouldn't slip. There's a hole in one place because I snagged it, so please consider that one as a bonus. I'm also selling other baby clothes and children's clothes. I can offer a discount if you purchase multiple items, so please contact me.