Hiya
When i was pregnant 1st time round i craved peanut butter but didnt have it as i thought the peanuts would cause a nut allergy. My m/wife told me, this time round, that if you and your partner have any allergy at all (like hayfever) this can cause nut allergies!! also she said there had been lots of research into nut allergies and apparently even though pregnant women are not eating nuts, many toddlers/children still have nut allergies so there seems to be no link!
I must admit i had a few handfuls of peanuts at christmas time and i no unsalted pistachio nuts are good for you so I have had them in moderation. x