The term 'Sound of Little Feet' is often used to describe the sound of children running around. The crossword solutions for this term are PATTER (6 letters), PITAPAT (7 letters), PITTER (6 letters), and PITTERPATTER (12 letters). PATTER is a sound made by quick, light steps, while PITAPAT is a similar sound but with a more rhythmic pattern. PITTER is a sound made by light, rapid taps or beats, and PITTERPATTER is a combination of both PATTER and PITTER.