As a size reference for our toddler 3ft 50lbs. Tall and skinny, I ordered 7/8. The sleeves and hem of the shirt are long enough to give her some room to grow. Without the baggy core of the shirt, and it doesn't lift when she leans or reaches for something. They are not transparent and do not show through and do not shrink after washing and drying. The colors didn't fade either. She loves these shirts and I'm so glad I found them. I would happily buy them again.
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