Substances
Herbal preparations
It is difficult to provide accurate, scientific advice about the effects of herbs on an unborn child. Many herbs are safe, and many are potentially dangerous. In general, unless the herb is widely known to be safe (such as herbal cough drops), it is safer to avoid them while pregnant.
Homeopathic Remedies
True homeopathic remedies involve highly dilute solutions, so these are considered generally safe during pregnancy.
Nutrasweet, Sweet’N’Low, Equal, Splenda
These are food additives, and have no known risk when taken in normal amounts.
Caffeine
not to exceed one coffee, two teas, or two colas daily (chocolate is so low in caffeine, it is not a significant source).
Smoking
strongly discouraged, leads to low birth weight, premature labor.
Alcohol
strongly discouraged, overuse can lead to fetal alcohol syndrome, mental retardation, birth defects. Minimal safe levels of intake have not been established.