The aMACEing ZERO LEAK Baby Bottle uses a patented nipple design to offer a truly leak proof baby bottle. Milk only comes out when your baby is feeding on the nipple. If your baby stops, the flow stops! This helps reduce the chances of health-related and potentially life-threatening risks. Our nipple also has a uniquely designed anti-colic vent which helps reduce colic and symptoms like burping, gas, and reflux to make sure feeding is always a great experience for both you and your baby. In addition to leak proof and anti-colic, the nipple also features a variable flow which keeps your baby in control! Our nipple design adjusts to your baby's rhythm allowing milk to flow at his/her pace. This single nipple will work well for your little one whether he/she is just born or 6 months old, just a little less to worry about. Our Bottles are BPA, lead, and phthalate free to ensure your peace of mind. When handling the Mace baby bottle, the patented collar makes opening and securing the baby bottle easier while the Mace bottle cap secures the bottle for safe transport. Our baby bottles feature a wide base, (2-5/8"), to help prevent the bottle from easily tipping over. Mace baby bottles come in 7 ounce. and 10 ounce sizes and feature both ml and oz measurement marks on the bottle. aMACEing ZERO LEAK Baby Bottle is safe to go in the top rack of your dishwasher. It is recommended that you wash all parts separately. aMACEing ZERO LEAK Baby Bottles have passed CA Prop 65, CPSC, FDA, and SGS testing. The packaging for our product has had two different versions: an old one (with the “1-6mo” age advisory), and an updated (made correction) one (“0m and older” age advisory). The stock we have in fulfillment centers may make up of bottles in both kinds of boxes, and which box our customers receive are at random orders. We just want to clarify the product is the 100% the same, regardless of packaging.