This MimiJumi Not So Hungry 4 oz Baby Bottle is the next best thing to breast feeding. The innovative construction mimics mother's breast, and is constructed to allow baby to latch on naturally and feed at the same rate because the nipple releases fluid slowly, helping to prevent colic. The top of the bottle snaps on and off, as does the non-slip bottom. The bottle has easy to read measurement lines, and is made of high grade medical plastic engineered in Switzerland so no worrying about harmful chemicals getting into the milk. All three parts are dishwasher safe top shelf.