Using echinacea as a treatment for a cold during breastfeeding should not cause a problem. I have had several moms use it with great success. I, however, do not promote its use on a daily basis (as a "preventative") for the breastfeeding or not. Wishing you health and wellness! Tami Karnes, One With Nature Certified Herbalist P.O. Box 1724 Sedona, AZ Sedona, AZ 86339-1724 [log in to unmask] (800) 230-5166 http://home.earthlink.net/~onewthnature/