At 12 mos old, I was worried about the 12 mos size being a little too small because of the weight classification. We got the 18 mos and it was roomy and comfortable. Perfect. It has layers under its skirt, doesn't feel flimsy and isn't see-through like cheaply made dresses priced the same as this. The lettering was huge across her chest and her name is only 5 letters long! Had to restarch and reshape the ribbons after dry cleaning. Wrinkles easily too!