I purchased the Medium / Large when it was on sale . I knew it would be big, but I didn't mind since every child grows. She was able to where it and I just had to roll up the sleeves 4 or 5 times. It doesn't look bad at all. It looks like the style of the Raincoat. The umbrella is truly adorable and perfect match to the coat. My daughter is almost 3 at 3ft. 4" and 54lbs. The small/medium would fit, but save some money in the future by buying a size up.