I have never had an issue bringing an infant in when I/we have been eligible on American, BA or Iberia - all without comment or question.

Now as soon as they turn two it is a different story and becomes much more difficult given the +1 requirement. So far I have been about 75% but it certainly causes stress and uncertainty.

I frankly think that two is the wrong age for these sort of cutoffs but that is a can of worms that I am hesitant to open as there is obviously no "right" age and any age will make certain people unhappy. I would like it if airlines made it a little easier to have a nice traveling experience when traveling with family as right now the rules are set-up for business travelers not people who use the benefits when traveling with their families.