I bought a size 5/6 for my 4 year old daughter. They fit perfect even after multiple washes. I'm convinced these are the best every day dresses you could buy for an active girl. I'm going to buy the short sleeved version for summer - that's how much I love them.
We have been buying the unshrinkable dresses since my daughter was one year old. She is 8 now she selected the chocolate/berry spritz color for fall. She loved it so much she wore it to church nearly every Sunday from October - March. It washes and wears wonderfully! You will not regret this purchase for your girls.