Patent ID: 6910594

Claim:
A method of nursing comprising: filling a bottle liner with milk, said bottle liner comprising a container comprising a flexible bag forming a tube with a generally flat bottom end and an open top end and a circular flange extending about the open end of the bag along an upper portion thereof and defining a fixed opening at the open end of the bag, the container having an inner surface extending from the bottom end of the bag and including a surface of the flange defining the fixed opening, and a lid comprising a wall projecting from a bottom surface thereof and configured to fit within the opening and a sealing ring having a diameter larger than the diameter of the opening and extending radially outward from the wall, the sealing ring being configured to fit within the fixed opening of the flange and form a fluid-tight seal with the inner surface of the container; inserting the container into a nursing device; opening the lid to expose the milk; and securing a nursing nipple to the nursing device with the container disposed therein.