After reading the reviews on this product I decided to order the small size (4/6) for my 4 year old daughter. She is 40 inches tall and weighs about 38 pounds and usually wears a size 4 or 4T in clothing. These tights are just the right length for her, but are slightly tighter around the waist. Although I believe all tights are pretty tight around the waist. That's why we hate wearing tights so much! The quality of the material is excellent - very thick and stretchy. These are the perfect tights for dancing and will definitely last a lot longer than other tights you can find in the store.