In a sing song voicy (no specific melody,) I used to hear this..

dozey dotes and maresy dotes but little lambsy divey. I remember wondering to myself why is she singing such strange lyrics? perhaps the word lyrics didn't actually come to mind at that point in my life.

Later in life I realized (but don't remember at which point) what the words really were. I sure hope I'm right. Does eat oats and mares eat oats but little lambs eat ivy.

Even after realizing the correct words, I don't know the point of the song (if that's what it is.) Perhaps Mom knows. Maybe my sisters know; I'm sure they've all heard it too.