I strive to be scientifically accurate as often as possible in all aspects of my life. That also extends to how I explain the world to my two year old.
I'm very excited about a book I just learned about called,"It's NOT the Stork". This book goes through basic vocabulary for body parts, introduces "where babies come from", and even highlights how to stand up for yourself, all in simple terminology. I'll add my own thoughts at the end, but I agree with everything this reviewer said (well, except that I'm not an RN):
By E. Szymanski
Format:Hardcover|Amazon Verified Purchase
My dad's parents were a doctor and nurse, and my family was always very practical about explaining anatomy. Penis, scrotum, vagina, vulva, and anus, are not bad words. They are medically accurate vocabulary. Vocabulary that I learned from a very young age. I'm so proud of my parents (and grandparents) for having the good sense to teach us what was correct, and to not be embarrassed by medical terminology. I hope to be as good with my daughter. Although she is two, I see no reason why we cannot learn all of the body parts. Why should she only learn, "head, shoulders, knees, and toes"? We don't dwell on any particular anatomy, and there is no need to make a big deal about it. However, it can be immensely useful for her to understand what all the parts of her body are, and what they do. This particular book is, in my opinion, still a little out of her age range, but I'm glad to have it as a reference for when we do need it (the cover recommends 4 years old).
I think we do a disservice to our children if we don't expect them to act maturely about their bodies. But then, how are they supposed to act maturely if we don't set that example?