Write the first line with clear and basic language. Personalize the lullaby to suit the name or gender of the child to which you are singing. Set up a rhyming scheme by making the last word of the first line a word you will rhyme with the last word of the second line. Make the first line: "Sleep tight my sweet little boy," for example.
Compose the second line in an identical manner as the first. Establish a physical context for the personal image you created in the first line. Finish the rhyming scheme with the last word of the line. For instance, write "Rest in your bed with dreams of toys," for the second line.
Begin a second rhyming scheme with the last word of the third line. Build on the first half of the lullaby by expanding the image you created in the first two lines. Make the third line: "You're safe and sound in mommy's arms," for example.
Complete the second rhyming scheme with the fourth and final line. Emphasize your love for the child and celebrate her meaning to you as the finale. The fourth and final line could be: "I love my son, he's safe from harm."