A container including a main body and a removable lid. The main body defines an interior cavity accessible through an opening at an upper end of the main body, and the main body has a rim about the opening. The removable lid secures to the rim of the main body to enclose the interior cavity. The removable lid includes an upper portion having a convex surface and comprises a soft, flexible material. The removable lid also includes a spout integrally molded with the upper portion and extending from the upper portion at an off-center location. The spout is shaped and sized to be received inside a child's mouth. The spout includes a wall and a flexible membrane supported by the wall. The membrane has a convex surface facing a distal end of the spout and forming a cavity within the distal end of the spout, and a valve configured to provide fluid communication between the interior cavity and the child's mouth when sufficient pressure is applied to the distal end of the spout.