We bought this costume for our 9 month old son. We bought 12-18 months as he usually wears warm and thick clothes under his clothes. It's a bit big for him, but we can say that he will fit a 12 month old baby well. I wasn't expecting this suit to be fleece lined but it is. It keeps him warm very well. Covered in mud, he crawls through the garden. We take off the suit, wash it (it was washed well and kept its size) and it's clean. Can't comment on how waterproof this suit is as it hasn't been exposed to rain or puddles. However, he dipped his hand in our dog bowl and the inside of the suit got quite wet. I'd probably say it's waterproof for heavy splashes, but if you're kids sitting in puddles expect water to seep through the seams. We have a fully waterproof raincoat for my daughter but no fleece lining. To be honest the costume turned out way better than we expected.
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