Booking infant a seat (not lap) on AA using Avios
I've booked a few infant tickets using Avios before but always as a lap infant. We have a longer flight coming up and I'm trying to book the little guy his own seat on AA using Avios. The similar FT threads I've read say I need to call to do this. I called and was told, by an agent who seemed knowledgeable, that AA does not allow Avios to make a seat booking for an infant, and my only option, if using Avios, is for the infant to travel as a lap infant. They do allow this on BA metal, but this is an AA rule. Is that correct, or is this a good time to call again?
Our backup is to book two Avios seats for the adults and use AA miles for the infant seat.
Thanks.