low you need to order at least one size up but maybe 2. I wanted XXL (18) for wearing it over sweaters and such next fall, but instead it suits him right now. 14 or maximum 14-16 after washing and drying. I haven't used hot on any of them, but they still shrink, and I absolutely refuse to dry my baby clothes just because companies don't pre-shrink their fabrics before production. So if you really need 18 I say skip that and find something better but if you can just buy a size or two these jackets are really cute and nice and soft on the inside and seem like a good warm jacket for to be the spring Also this price is worth a try.
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