D.J.
I have an 8 month old and I found this website that gives some good suggestions as to when to give certain types of foods: http://www.wholesomebabyfood.com/forbiddenbabyfood.htm
I think it's pretty good and it mimics the things that I've already been told by her pediatrician so that is comforting.
It says to wait to give any citrus or acidic foods until after 1 year.