The innovative MAM Anti-Colic Bottle was developed together with medical practitioners and developmental psychologists to meet baby's feeding needs at every stage. MAM bottles are available in an assortment of colors and playful design motifs. All bottles utilize MAM's patented, ultra soft silicone nipple for an easy transition between breast and bottle and feature leak-proof caps that help keep bottles clean when not in use. Anti-Colic Patented ventilation holes in the bottle's base regulate the pressure balance of baby's milk, allowing milk to flow evenly without bubbles or air pockets for reduced gas and colic symptoms. Ultra Soft Symmetrical Nipple Like the MAM pacifier nipples, the nipple on the MAM Anti-Colic Bottle features a symmetrical shape and brushed silicone feel. The MAM Ultra Soft Silicone nipple makes switching between breastfeeding and bottle especially easy. Easy to Clean. Wide openings at both ends allow for effortless filling and cleaning, and an innovative self-sterilizing feature lets busy parents sterilize an empty bottle in the microwave with a few simple steps. The spill-proof cap protects nipple from dirt and also works as measuring cup thanks to integrated scale - even for the smallest amounts. BPA Free and Baby Safe Like all MAM products, the MAM Anti-Colic Bottle is BPA-free, PVC-free, lead-free and CPSIA-Compliant.