The non-toxic Mixie Baby Nipple accommodates your growing baby when using the Mixie 4 oz. and 8 oz. Baby Bottles (sold separately). Made from silicone, the Mixie Baby Nipple makes it easy for baby to get the right flow. Choose Stage 1 (for newborns-3 months), Stage 2 (for 3 months-6 months) or Stage 3 (for ages 6 months and up). Top-rack dishwasher safe.For more information, click here.