I have a few nurse friends, faeces, excrement, excreta, poo and shit all figure large in conversations!
When we moved, DD aged 3 smeared poo all around her bed on the walls. I was really upset at the time, I thought she was going to turn into some weird person, but apparently it's a normal way for children and animals to mark out their territory with the only means at their disposal. Just goes to show how our instincts haven't been entirely bred out of us.
I have had several friends who have admitted to their young children eating poo. Their own and that of pets. I think it's just something that most people used to be too inhibited to mention.
I remember being scared to ask for a loo when visiting a friend's mother's house. She realised what I needed, and said 'Don't be embarrassed, we are all the same, even the Queen doesn't shit into plastic bags wearing gloves'!
In Kent there is an abundance of damsons and foxes. This results in large quantities of purple poo in gardens and lanes. My visiting nephew, on a country walk, once got to a pile of fox poo before we could retrieve it from his mouth. He was three and said it was lovely. My sister, being a germaphobe who prefers town life, looked at me as if it was my fault.