I never heard of it either, other than as any food that should be only eaten with good judgement. If the mushrooms have been gathered from the wild by someone who doesn't really know what they are doing, it would be foolish for anyone to eat them, which would include a pregnant lady. But store-bought mushrooms are raised under controlled conditions.
I googled it an all I found was that mushrooms are a good source of zinc which is important for good development of the baby and the warning against eating mushrooms unless you are certain of what kind they are- that is, not poisonous.
at 2:11 PM on Mar. 7, 2009