W.L.
If it makes you feel better my daughter used to play with her poop at 2 and 3. In fact she liked to "paint' the walls and carpet with it. She is a very kinesthetic girl. She plays with toys based on what feels good in her hands. She is also very concerned with how clothes feel. I try to indulge her need to feel things with letting her play outside in the mud and dirt, playing with playdough. I buy her the animals she likes because of the way they feel. I too am intersted in the book mentioned by the first respondent.
Isn't life grand!
W.