Abstract: A method and related apparatus for expelling air from a flexible liner baby nursing bottle includes an axially elongated connecting rod which is guided and carried by a support bushing having the general size and shape of the lower open end portion of the shell body of the nursing bottle. The support bushing is located intermediate a disk shaped ram portion at one end of the connecting rod and a supporting handle at the opposite end of the connecting rod. The support bushing is inserted into the open end of the shell body and the ram portion is moved axially along a rectilinear path to decrease the volume of the flexible liner and expel air from within the cavity formed by the nipple and the flexible liner through an orifice in the nipple at the upper open end of the shell body.