Adelle Davis has been widely considered the first lady of nutrition. She had a degree in biochemistry from USC and wrote several common sense books on nutrition back before the word "vitamins" was even part of our vernacular. They are really must-haves and are great for learning the cause-effect relationship of nutrition and various symptoms the body can present.
One of those books is all about having healthy children.
There are also some websites out there that serve as digests for some of her books. Here's one underscoring her viewpoint on b-complex and it's vital role in health.
Link: Adelle Davis Revisited