Abstract: A bottle assembly for feeding an infant comprising a hollow exterior housing having open top and bottom ends, and a disposable insert member selectively insertable into and releasably attachable to the housing. The insert member comprises the nipple portion and a sack portion extending from the nipple portion which is adapted to be filled with a liquid. The nipple portion protrudes from the top end of the housing and the sack portion resides within the housing when the insert member is secured thereto.