both my parents are veterinarians. for as long as i can remember (since i was 3 or 4) i rode around with my father on farm calls. i saw stillbirths, large animals breeding, animals being put down, gory surgeries, and my dads arm up to his shoulder in cows' and horses' asses. i turned out great.lol
but really.. none of that "scarred" me. at a young age, shelter him from drugs, domestic violence, swearing, porn.. that kind of stuff. but i think he'll be fine learning about and witnessing mother nature.