The Baby In "Doctor Who"

I think I've found out why there was a casting call for a baby for the upcoming series of "Doctor Who". It isn't a baby for Amy Pond, as originally rumored. It's actually gonna be James Cordens character, Craigs baby. I saw this video on YouTube of The Doctor and Craig standing talking in House Of Fraser. Craig is holding his baby and The Doctor is holding a Cybermat, which tells us that The Cybermen ARE returning to the show.
Here's the YouTube link to the video: http://www.youtube.com/watch?v=ZUQG9aTglNg