Old MacDonald has a very busy farm. There's a moo moo here and a cluck cluck there. And then comes the Waa! Waa! What could that be? Could it be the sound of Old MacDonald's new baby?Old MacDonald has a very busy farm. There's a moo moo here and a cluck cluck there. And then comes the Waa! Waa! What could that be? Could it be the sound of Old MacDonald's new baby?