Purchased size 12-18 month for my soon-to-be one year old. Little snug around her belly, but overall great fit and beautiful crochet detail. I live in Texas, and pictures were taken outdoors, but luckily this material is thin and breathable so that was a bonus. With that said, the material is thin enough to see any kind of diaper detail/design (even the blue line once it’s dirty), but luckily for us, I had a cream/white cloth diaper to use for the shoot and it worked well for us!