Baby King Premie Printed Bottle is the unique design of the smooth flow nipple allowing the baby to control the rate of milk flow for colic-free feeding. The bottles and nipples are 100% free of BPA, polycarbonates, PVC, and phthalates. Slow Flow Nipples and the bottle mimics the shape of the nursing nipple during breastfeeding, for a smooth transition from breast to bottle and back. Soft Flow Bottle and Pacifier Set is a 100% pure glass bottle with our award-winning nipple with an adaptable design. It is baby-safe - medical-grade borosilicate glass that is free of BPA, BPS, phthalates, and toxins. Anti-colic soft silicone nipple flexes like mommy for easy closure.