According to the footnotes given in Cindy Mao and Ma Baolin's Sing Chinese
, the song is a popular nursery rhyme in China. Its short and well-rhymed lyrics make it easy to remember.
This is indeed a short ten-bar ditty which even the most unmusical parents should have no difficulty in "singing" and I'm sure even occidentals could manage the " bù wá wa, bù wá wa. dà dà de yan jing hei tòu fa. cóng lái bù shuo huà. yòu gan jìng, yòu mei lì. ta shì gè hao wá wa,
. It has a hypnotic quality with the easy vowel repetitions.