Baby bottle, and method of production of a baby bottle

A bottle comprising:

• a bottle jacket open on both sides, wherein a base cap including an air intake valve is fastened to a bottom-side end region of the bottle jacket, and
• a teat fastened to an opposite, teat-side end region of the bottle jacket, wherein the bottle jacket is open in each of the bottom-side end region and the teat-side region, which teat comprises a shaft and a nipple following said shaft via a lip contacting region,
• wherein the bottle jacket has a substantially conical shape widening from the teat-side end region to the bottom-side end region and the wall thickness of the shaft of the teat is greater than the wall thickness of the teat in the lip contacting region and of the nipple,
• wherein the base cap comprises a central elevated portion, and a circular ring-shaped diaphragm for providing an air valve in the manner of a flap valve, and
• wherein a sealing lip is provided at an inner end region of the diaphragm, which is angled relative to a base-cap-adapted course of the diaphragm, such that in a closed position of the air valve only an inner end portion of the diaphragm abuts on the central elevated portion of the base cap in a pre-stressed state.