Welcome to Flyertalk.
I would advise you to read:
http://www.flyertalk.com/forum/infor...tion-desk.html
"For example, do not post in the Info Desk about...
One Specific Airline or Program"
On the substance, unfortunately you haven't identified anything that AA did wrong. Someone has to fly in the middle seat. AA can't ensure that an infant behave.
You should always be prepared to gate check a large bag, and take out anything you might need.
Welcome to the reality of travel.