A lot of people are emailing and posting about the amount of soy in my son's diet, which I expected. Rather than see it hashed out again and again, I thought I could create this special soy post and refer people here as it comes up (I'd like an FAQ for frequent questions like this, but until I get to it I thought having a specific post I can link to would be the closest thing).
I like what John Robbins wrote about soy on his website here and here. But I think the site I would most recommend is Bryanna's Soy Concerns FAQ -- it's very comprehensive and well-researched. Thank you, Bryanna!
If you're worried about soy there are plenty of other things you can eat, even on a vegan diet. Some people decide to limit their soy consumption to traditional soy foods, like tofu, tempeh, soymilk, and miso. A lot of Jo Stepaniak's books contain soy-free recipes, including the Food Allergy Survival Guide, which is perfect for those out there with soy (or other) allergies.