I don't want to sound harsh, I love kids, have some of my own, however, why should I have to move my preselected seat because of your child? I hate the aisle, never sit in an aisle and wouldnt want to be in an aisle. I know it is for a child, but it is not MY child and why should I give up the enjoyment of my flight for yours?
Many of us choose a specific seat on a plane for specific reasons, sorry there was an airline switch and your 3 yr old (who would not even remember or enjoy the fact that she was in first) is no more important than me and my status.
I hate when people think they are entitled to special privileges just because they are traveling with a child. I personally do not think children belong in FC in the first place,