Rubber Ducky, You're the One

Gal is saying 'duck'. The first time that I heard her say it was about 2 weeks ago. She was in her exersaucer and looking at a picture and then saying 'duck'. She may have learned it from the song Rubber Ducky. She has a rubber ducky that we play with at bath time. Daddy comes in every night and sings the song to her.