My wife and I are looking flying back to the UK from LAX to show off our new baby. I want to upgrade us to Biz and I am not sure how the fares will deal with little (3mth) Isabella. We do not plan on bying a seat for the baby, so what are the rules with regards to fare.

I can either get a Biz award for my wife or purchase Coach and ugrade her with a VIP04 or VIP03. What would the fare (if any) be in these scenarios for Isabella? Any advice would be gratefully received.