I accidentally bought two boxes. This is ✨unopened✨. The Pigeon Mother's Milk Bottle is designed to allow babies to "drink naturally," the result of over 60 years of research. It allows babies to drink with the natural movements of their mouths, making it easy to use in conjunction with breastfeeding, and allowing you to continue breastfeeding with peace of mind. 【Precautions for Use】 ● After use, wash thoroughly with a dedicated brush, etc., and then sterilize. ● When not in use, store out of the reach of children. Sterilization methods: Boiling ○ Microwave ○ Chemical solution ○ 【Care Instructions Before and After Use】 ● Be sure to wash and sterilize before using for the first time. ● A safe, white powdered food additive is applied to protect the air valve. In addition, due to the characteristics of the material, some of the ingredients may leach out. This is safe, but please wash before use. ● After use, immediately soak in lukewarm water and wash with "Pigeon Bottle Wash," etc. ● The tip of the nipple is very delicate. When washing with a cleaning brush, etc., wash while holding the tip of the nipple with the pad of your finger. ● Gently rub the air valve and air vent, and the suction hole with both hands. Washing too hard or pulling on them may cause the valve to tear, leading to leaks. ● Before setting, pull the air valve on the bottom plate from the back to make sure the air valve opens.