Safe and Reliable Materials: YOHKOH Natural Baby Bottles are made of high quality borosilicate glass, pure and clear without impurities. Paired with a liquid silicone nipple, it can help empty the bottle of air, and the baby can comfortably complete the feeding. Different Age Stages: 100ML/3.4oz with S slow flow nipple for 0-3 months +, 160ML/5.4oz with S slow flow nipple for 3-6 months +, 260ML/8.8oz with M medium flow nipple for 6-12 months +. Meet the needs of all stages of the baby. Breastfeeding-friendly: Glass natural baby bottles with natural response nipples can control the speed of milk according to the baby suction, just like the natural sensation of breastfeeding. Silicone Nipple: The nipple is made of food-grade silicone and is super soft, allowing babies to suck naturally. The bottom of the nipple has intelligent pressure regulating valve, balance internal and external pressure, milk and air separation, to avoid the baby breathing too much air caused by colic flatulence. Easy to Clean: Only a few parts, easy to assemble. A variety of ways to clean, can be washed in high temperature water or steam, dishwasher safe (top rack only). The bottle pattern and scale are made of durable non-fading ink with clear scale. YOHKOH Natural Glass Baby Bottle for Breastfeeding Babies, Newborn Anti-Colic Bottle Set with Slow Flow Nipple, 6-12 Months, 8.8oz, 4 Pack - Multicolour2