Hi, I am considering an award booking to which I would need to add a lap infant. I have looked around and seen a mix of reports on the cost for this. People generally agree that economy is just 10% of the award cost (i.e., 10% more miles). But I have seen a mixed bag of answers for business/first. Some say business/first is like economy with a 10% mileage cost and some say it is 10% of what the flight would have cost is it was a revenue booking. Can anyone provide clarity? Thanks!