The size is unknown, but I received it as a baby shower gift, so I think it's baby size. * I measured it with a ruler, and it was about 8cm. However, this is a rough measurement. It's much cheaper than the retail price + shipping! Therefore, no price reduction. I will ship it as is in an envelope. If the thickness exceeds 3cm, I may open it and adjust the thickness. Thank you for your understanding. Brand: Children's Clothing Kids' Clothing Baby Pregnancy Preparing for childbirth