Baby bottle with ribs on inner surface of nipple

A baby bottle comprising:

• a nipple for the baby bottle, comprising:
• an elongated tip formed with one or more flow holes through which fluid flows, the elongated tip having an inner surface and an outer surface,
• a base connected to the elongated tip and wider than the elongated tip, the base comprising an inner surface and an outer surface, the inner surface of the base facing towards a container of the baby bottle and connected to the inner surface of the elongated tip, and the outer surface of the base facing away from the container and connected to the outer surface of the elongated tip, and
• ribs on at least a part of the inner surface of the base and configured to enhance elastic recovery of the nipple from elongation or contraction of the base in an axial direction of the nipple, the ribs slanted relative to an axial direction and a circumferential direction of the nipple, the ribs comprising a first subset of adjacent ribs and a second subset of adjacent ribs next to the first subset of adjacent ribs, upper ends of the first subset of adjacent ribs terminating within the inner surface of the base, and upper ends of the second subset of adjacent ribs terminating within the inner surface of the elongated tip;
• and
• a container configured to hold the fluid and secure onto the nipple.