Munchin tri-flow angled bottles are a wonderful baby bottle to feed your baby due to the three vents that regulate the amount of liquid that flows from the bottle. Therefore you are not required to purchase multiple different size nipples due to one flow rate. If you are a new expecting mother this is important to you: babies eat a different flow rates... meaning that babies occasionally will suck and get either too much food or not enough food at a time. With the tri-flow angled bottles that problem is easily remedied by a simple twist to find the right flow for your baby. This means less colic and more satisfying feedings due to reduced gagging and gulping. Your baby will suck in less air. These bottles also are available in 4 o 8 oz size, and are ideal for all ages. The angle bottle will allow for easier feeding to keep yoru baby up right and less prown to spit-up, gas, and other common problems.