Have used all four pairs regularly. They've pilled a little, but are still cute, and have retained their stretchiness. Got them at a sale price, and would recommend them at that sale price, not the full price. No problems with deep red marks, but the light kind that come from anything being up close to the skin for prolonged periods of time. (The kind that goes away within a few minutes of removal.) My baby is and has been average size/weight, and she is 13 months old, currently, and we been using these most of her life.

UPDATE: After over 2 years, these are going strong, and I'm using them on a second baby! No holes, no problems with the stitching, colors are still vibrant. Great for paring with cloth diapers, too! It's fun coordinating the leg warmers with the cloth diaper covers. And they really protect her knees when she crawls. So happy with these! I've updated them to 4 stars for their durability.