An air venting apparatus for a milk bottle having a soft teat for a baby to suck, a bottle for containing milk, and a fixing frame for fixing the soft teat to the bottle without leakage. In the air venting apparatus, an upper plate is disposed between the top of a body of the bottle and the base of the teat and has at least one air inlet groove for guiding external air into the bottle body. A lower plate is combined with the upper plate and has at least one thorough hole and an air control valve to control the amount of the introduced air and discharges a gas generated from high-temperature milk outside the bottle body. An annular connection member is combined with the lower plate and provides the amount-controlled air into the bottle body.