Molasses ? When you bake waffles or muffins you could always add some !
I can't see where you are located from your profile but I use some UK books at home that contain very useful information on nutrition:
UK books I liked :
Veggie Food for Kids, by Sara Lewis (Hamlyn) - ISBN 0-600-60887-5
Healthy Eating for Babies & Toddlers, by Anne Sheasby and Jill Scott (Bramley Books) - ISBN 1-85833-399-7
Both are meant for (very) young kids but are definitely useful for older children and even adults !
One other book I found useful even though it is not vegetarian (it does contain a lot of veggie/wholemeal ideas) :
First Foods, by Dr. Miriam Stoppard, DK Healthcare, ISBN 0-7513-0554-5
I am sure you can easily find equivalent books in the USA or anywhere else.
Also, someone posted this link on VB
recently which is a site that gives basic information about nutrition and all the data you might wish for :http://www.nutritiondata.com/
I never had any problems with my kid because after nursing, I switched to vitamin (and mineral) enriched soy milk for toddlers. Which she likes so much she still drinks it (at 5 !).
Further unexpected sources of iron include watermelon, raisins, and grapefruit You can also find iron in tomatoes, apples, bananas, oranges, strawberries, and avocados. You could also look into iron fortified cereal, there's organic stuff out there as well. I used to give my daughter organic ground-up muesli ("baby muesli") from Germany.