The cushion is even after the first wash (with liquid mild detergent or baby shampoo and then dry transition with dryer or tennis balls at the highest level) as the purchase, because it still smells quite strong already at the beginning, but this is normal with feathers / Dauen in plastic wrap. By briefly shaking the spring are all on how complete and the pillow is filled as when buying, how to do that also expects a full pillow. Very positive is that the children do not sweat in the pillow, it is breathable due to its material, for this reason I had now but decided after 2 years still for such a cushion. Although we had good cushion that a polyester filling was there but inside, my child got in the summer always sweaty hair.
I've already bought some down / feather products at Amazon and have been very good experiences with the brand Šumava and ARO. Of course you always have to follow the care instructions. When down, it is important to have a dryer at home, perhaps even minutes. 6 kg is the dryer, so that the down can fully unfold again during the drying process with the tennis balls.