Size 6 months, but definitely runs larger! Patagonia site said fits 15-20lbs / 25-27in (picture of sizing for reference). Worn a couple times- like new! Originally $109. For girl or boy From the Patagonia website: The Baby Down Sweater™ has a NetPlus® 100% postconsumer recycled nylon ripstop shell made from recycled fishing nets to help reduce ocean plastic pollution; is insulated with warm, compressible 700-fill-power 100% Recycled Down (duck and goose down reclaimed from down products); and layers easily for warmth in colder conditions.