A convertible childproof to non-childproof bottle comprising a container that has a mouth opening, a lid selectively movable between a closed position in which it closes the container mouth opening and an opened position in which it clears the container mouth opening for allowing access into the container, complementary interlocking and releasable first container and lid locking elements respectively located on the container and the lid engageable to releasably lock the lid in the closed position, and complementary interlocking and releasable second container and lid locking elements engageable to additionally releasably lock the lid in the closed position. The second container and lid locking elements can be permanently disabled to convert the bottle from a childproof mode where the lid is releasably locked in the closed position by both the first and second container and lid locking elements to a non-childproof mode where the lid is releasably locked in the closed position by the first container and lid locking elements only.