Long-term, excessive use of licorice can cause hypertension, hypokalemia, and disturbances of adrenal hormones, and therefore should probably be avoided during nursing.

Is licorice root safe for babies?

Using the Herb Research Foundation's rule of thumb that a child's dose ought to be one-fourth to one-third of an adult's, a child should take no more than 4 or 5 grams of licorice a day. Bottom line: OK in small amounts, but be extremely careful -- and be sure to tell your child's doctor about it. St. John's wort.

What teas to avoid while breastfeeding?

Chamomile (German) or ginger tea are considered safe, for example, but stay away from any tea with goldenseal. Avoid these herbs. Some interfere with lactation and some could be harmful to your baby.