The story details the cycle of life by chronicling the experiences of a young son and his mother throughout the course of the boy's life, and describing the exasperating behaviour exhibited by him throughout his youth. In spite of her occasional aggravation caused by her son's behaviour, the mother nonetheless visits his bedroom nightly to cradle him in her arms, and sing a brief lullaby promising to always love him. After her son enters adulthood and leaves home, his elderly mother occasionally sneaks into his bedroom at night to croon her customary lullaby. However she gradually grows old and frail, and her grown son visits his feeble, sickly mother for the final time. When he first arrives, his mother tries to sing her lullaby to him, but she is too weak to finish. He then cradles her in his arms and sings an altered rendition of her lullaby in reciprocation of the unconditional love that she had shown him throughout his life, vowing to always love her in return. After returning home in a scene implying the death of his mother, he cradles his newborn daughter and sings his mother's signature lullaby for her, implying that the cycle will continue.