Nipple structure

A pacifier structure being mounted on a nursing bottle comprising:

• a rotatable cap, a body, and a filtration member;
• the rotatable cap being mounted on a mouth of the nursing bottle, and the rotatable cap including a peripheral groove formed around an inner wall thereof;
• the body including a suction portion and a surround plane arranged around a bottom of the body and connecting with the peripheral groove of the rotatable cap, the suction portion being hollow, the surround plane having an air valve extending to the nursing bottle from the surround plane, the surround plane connecting with the peripheral groove so as to produce an air chamber, and a trench being defined between the body and the peripheral groove;
• wherein the filtration member is connected inside the body and includes a ring portion, at least one connection tab and a mesh portion, wherein the ring portion contacts with the surround plane of the body and has an arcuate recess configured to accommodate the air valve, the at least one connection tab extends upward from an inner side of the ring portion and connects with an inner wall of the body, wherein a diameter defined by the at least one connection tab is more than an inner diameter of the body, the mesh portion is hollowly conical and has a large section adjacent to the ring portion and a small section away from the ring portion, wherein the large section of the mesh portion is more than the small section of the mesh portion, and the mesh portion has multiple orifices formed on the small section thereof.