When my wife got pregnant with each of our three kids, every single time the doctors asked her if she was a vegetarian. The reason being that if she was (she isn't), they would have to put her on a strict diet of pills and vitamin supplements. I don't think it mattered how well a woman thought they were getting all their necessary intake, if they were vegetarian, they went on the plan. These were different doctors in different parts of the country each time, so it's not just one doctor's opinion, and it was about 4 years apart each time. According to my wife, that's good enough for her to never even think about going down the vegetarian path.