The present invention relates to a feeding bottle adaptor includes a ring and a cylindrical portion. The ring comprises several slots on its lower side. The cylindrical portion connects with the lower side of the ring. The cylindrical portion comprises several apertures which pass entirely through the cylindrical portion . The adaptor is used to set on a feeding bottle. Then when the fluid withdrawn from the feeding bottle, air can enter the feeding bottle through the slot and aperture so that pressure within the bottle remains the same as pressure outside the bottle.一種奶瓶氣壓調整配件，包括有一環圈與一圓柱狀部，該環圈底側設有複數凹槽，該圓柱狀部連接固定在該環圈底側，並該圓柱狀部貫穿有複數開縫，而該調整配件是用於裝設在奶瓶，裝設後當奶瓶內的液體被吸出時，外部的空氣可經由該凹槽與該開縫流入奶瓶內，進以使瓶內壓力以與瓶外一致者。
