Mystic Pizza (1988) is full of Portuguese heritage. What is the lullaby Jojo sings to Phoebe?

While Phoebe's original babysitter is on a date with Phoebe's father, Jo Jo babysits. She is sitting on the couch with Phoebe on her lap, and is singing her a lullaby in what I believe to be Portuguese. My family hails from Portugal, and no one in the family can translate this song. It sounds like "ah nah nay nay, a cuca vay nay ah." Can anyone translate this to English for us? Thank you all so much.