Originally Posted by
azepine00
I wonder if you are getting hit with a combination of 10% infant fee and multiple YQs. Try to replicate your itinerary on ITA to check full fare cost and calculate 10% part. Also IIRC YQs should not be applied for lap child but I am not entirely certain if all airlines do it that way.
+1 - good advice. I just checked on ITA and it appears it will do infant (on lap) fare calculations automatically. I tried on a few flights and it looked like it was working correctly. On a CO EWR-LHR flight it correctly left out the YQ for the infant resulting in a fare of $1377 for the adult and $183 for the infant.
There may well be some airlines that will charge the YQ on infant fares though..