Sorry Laura, i did not realise you had posted a question to me. I am not basing my conjecture on the mention of B12 post-pregnancy, though there are many mentions on sites dealing with B12 deficiency that pregnancy can be a drain on reserves, especially in the case of vegetarian and vegan people. Rather I was referring to people over the years who mentioned that they developed PD within a few years of having a child. I am one of those, my son was under 4 when I got the first symptoms. If anyone has done any work on this specifically, I would be really interested to read it. :-)