Subject: Do Cardinals move their babies if they feel the nest isn't save for them?

I have a Cardinal nest with two (2) eggs.  One hatched a couple weeks ago and 
this morning the mother and the one baby are gone.  I know that the baby was 
too young to fly so could the mother have moved the baby to another location if 
she felt that they were in danger of us walking up the sidewalk past it daily?  
I am concerned something happened to the baby.

Re: Do Cardinals move their babies if they feel the nest isn't save for them?