This is an infant inner cushion for a child seat. Applicable conditions: Weight: Up to 7 kg Height: Up to 65 cm Age: Newborn to approximately 6 months There is no instruction manual. I received this from an acquaintance and used it a few times, but I am selling it because I have no further use for it. I believe there are no noticeable stains, but please consider that this is a used item. When shipping, I will use recycled materials and ship in a simple manner.