Ready to upgrade your bottle feeding routine? BIBS Glass Baby Bottle offers a sleek, award-winning design with an anti-colic valve designed to help reduce air intake and bubbles, a breast-like nipple to help ease the transition between breastfeeding and bottle feeding, and a built-to-last durable borosilicate glass base. Comes with a medical-grade silicone nipple, which is hypoallergenic and features durable ribbing and a skin-like frosted texture intended to aid proper oral placement and help prevent unlatching during feedings. Medium flow / BPA-Free / Ages 0+