Final answer:
The NCCIH recommends that pregnant or breastfeeding women use herbs only with physician approval. Women should avoid substances that could harm the embryo or fetus. Prenatal care is important to monitor the health of both the mother and the fetus.
Step-by-step explanation:
The National Center for Complementary and Integrative Health (NCCIH) recommends that women who are pregnant or breastfeeding should use herbs only with physician approval. It is important for pregnant and breastfeeding women to avoid substances that could harm the embryo or fetus, such as alcohol, illegal drugs, and some medicines. The developing fetus is completely dependent on the mother for life, so it is crucial for the mother to take good care of herself and receive prenatal care to monitor the health of both the mother and the fetus.