Two-piece set Bobbly knit: 6-9 months Flare pants: 1-3 months Worn by my son around 7 months old Worn by my daughter around 3 months old The knit material has some pilling, but I didn't see any noticeable stains. This was one of my favorite combinations and I often got compliments on it, so I'm selling it. Please note that this is stored at home.