I used this for about a month when my baby was a newborn. After each use, I washed it with baby bottle detergent and sterilized it in the microwave. The Pigeon Hospital and Clinic Baby Bottle (Direct Attachment Type) KR-100 is a baby bottle often used in hospitals and maternity clinics, and it can be fitted with a Breastfeeding Realization direct-attachment nipple. Since I only used it for a short period during the early newborn stage, there are no scratches or marks, but the nipple has a characteristic yellowing. I have washed and sterilized it in the microwave one last time, so please check the photos. I will wrap it in bubble wrap before sending it.