As someone who's not particularly sympathetic to the vegan cause, I tend to agree with the things Nina Planck says in her NYTimes column today. But I am not very well informed about the scientific details here, so I presume vegans will come forward to justify their choice not just for themselves, but also for their children. If you know of any rebuttals, please let me know, so that I can link to them too. Here are two key paragraphs from Planck's column:
I was once a vegan. But well before I became pregnant, I concluded that a vegan pregnancy was irresponsible. You cannot create and nourish a robust baby merely on foods from plants.
Indigenous cuisines offer clues about what humans, naturally omnivorous, need to survive, reproduce and grow: traditional vegetarian diets, as in India, invariably include dairy and eggs for complete protein, essential fats and vitamins. There are no vegan societies for a simple reason: a vegan diet is not adequate in the long run.