cyberfish, in a study of babies exclusively BF babies for 7 mo ( I think you LO was for 6? close enough? lol) who received no iron supplementation had no cases of anemia at 1 year. This only applies to exclusively BF babies, though, I don't know your exact situation. for more info look here:
http://www.kellymom.com/nutrition/solids/delay-solids.html
and
http://www.kellymom.com/nutrition/vitamins/iron.html
http://www.kellymom.com/nutrition/solids/delay-solids.html
and
http://www.kellymom.com/nutrition/vitamins/iron.html