I purchased this for my son, who was born in March 2024. Since I ended up exclusively breastfeeding, I'm offering one unused nipple. As this is my first child, I wasn't sure about nipple sizes and bought several. If you'd like, I can include ONE sterilized, unused nipple in either SS, S, or M size. This might be a good option for those who want to try different sizes. ◆ Pigeon 母乳実感 (Pigeon Mother's Milk Real Feeling) ◆ Size S / 1 piece Please refrain from purchasing if you are sensitive to items stored at home, as the included nipple will be used. I plan to ship it without the box, and the nipple part may be slightly compressed. However, it's made of silicone, so it shouldn't affect its use. Thank you. Discounts available for combined purchases.