Used only a few times. Unfortunately, it didn't suit my child, so I'm selling it. No diaper changes have been done on this. *The box and instruction manual have been discarded, so they are not included. *********************************** 【1. Feeling of fullness: The stomach is properly satisfied. Therefore, they can sleep soundly.】 A baby's stomach, which is still underdeveloped, is almost cylindrical. Therefore, if you lay them down on a flat surface, they will spit up more of the milk they've just drunk. NidooBio has a 15° incline, derived from verification by medical institutions. This incline increases the amount of milk retained in the stomach, allowing them to sleep soundly with their stomach properly satisfied. 【2. Feeling of comfort in the stomach: Bowel movements can also be done naturally. Therefore, discomfort in the stomach is also relieved.】 In fact, babies don't know how to have bowel movements very well. One reason for this is that they cannot control their sphincter muscles well. By raising their legs moderately, the sphincter muscles naturally relax, supporting them in having bowel movements without difficulty. 【3. Sense of security: Comfortable sleep with a C-curve that feels like being in the mother's womb.】 Babies were in a tightly curled posture in their mother's womb. After birth, their spine shape, which is suitable for such a posture, changes with growth. NidooBio has a gentle C-curve suitable for babies in the transitional period of growth. It does not interfere with the changes in the growth of the spine and is close to the posture in the womb. 【4. Stable posture: NidooBio does not collapse the posture. Therefore, it is safe, comfortable, and effective.】 Babies have sensitive skin, put everything in their mouths, and sweat a lot. The material of the bedding is also important for such babies. Because it is a material that covers these characteristics, it is comfortable even when used all day long! 【5. Hygienic environment: The material is antibacterial, breathable, and highly absorbent, so it is always comfortable.】 The cover part is made of quick-drying bamboo viscose material. Bamboo viscose absorbs moisture 3-4 times faster than cotton. Babies who sweat a lot can stay cool and comfortable all day long. It is a natural material with low allergenicity and antibacterial properties, protecting the baby's sensitive skin.