I purchased a a bunch of these for my twins at the beginning winter. They are 6 years old and both are on the smaller side in height, and my daughter is just small all around. After being washed, the sweats didn't cover the ankles of either twin. I purchased the xs 5 for her and the small 6-7 for my... son. The sizes I purchase for them in most brands. They wouldn't wear them because their ankles were cold. Money down the drain yet again! I tried to put my daughter in the 6-7 hoping it would cover her ankles and I could at least save those. You couldn't tie those things tight enough to stay up on her. She wears an xs in Abercrombie and Under Armour which are perfect in length with a little extra room in the waste. They can be untied and not completely fall off her. I included pictures of the xs on my daughter. Imagine how bad it is when they would sit! So tired of wasting our hard earned money.