Children for children songs often take place within a setting. First we see a small scene, after which a song is sung. If the song is supposed to be about a cute rabbit at a petting zoo, we will first see the children at the petting zoo, while talking about the rabbit.
At some point the song is started. First someone sings the couplet, then a chorus follows that is very easy to sing along to, then someone else sings a couplet and then the chorus follows again. Pay attention to the typical childish demeanor and amazingly klutzy dances that accompany them.