The way I see full term is like this...

When you are pregnant, full term may be 38-42 weeks - ultimately baby decides on it's own when he / she is coming. But either way, that was their full term. As far as breastfeeding goes, full term is as long as baby wants to go too - be it sooner or later...

Another word I wanted to throw in was the change from birth plan to birth intentions. Of course, we can't plan our birth as things happen, but if we do our 'birth intentions' then it is much more flexible. If you see it around the site you will know what I am on about anyway, because I have already converted