Pigeon Flexible Glass Bottle With Added Nipple M made from non-toxic international quality borosilicate glass for safety and durability Pigeon Flexible Glass Bottle's unique venting system minimizes swallowed air, Preventing Gas Pigeon Glass Bottle Comes with 2 nipple Convenient to use, carry, sterilize and clean and ideal for 4+ month babies BPA & BPS Free,Encouraging baby to use natural sucking pattern