Some songs seem to positively demand the repetition of the first verse at the end- Young but Growing being one, and to my mind the meaning of the "bonny boy" who is growing moves from the husband to the child. (I'm not sure if this is a "big" song, is there a standard for size?)

I once chided Eddie Murphy of Salmontails for repeating the first verse- the next time he was singing, he didn't do the repetition, and the song sank like a brick in a bucket. He cast such a sad look at me, I had to admit I was wrong.

Others don't demand the repetition. It's all a matter of taste and part of the storyteller's art, which I sadly lack much of.