Dear Melissa,
Just got a book from our local health food store (B&C) called
Handbook for Herbal Healing ... a concise guide to herbal products.  It seems
to be an excellent source of information and inexpensive at that (on sale
2.95).  It is written by a fourth generation herbalist...Christopher Hobbs.
 Has whole sections on herbs/pregnancy and herbs/children.  He says echinacea
is well known for use during pregnancy.  He says use low to moderate dosing.
 Bought this book for my own info.
Great book-very practical.
Warmllly, Ilene (where it hit -30 around the Boston area last night with wind
chill Brrrrrrrr!)