A brief sudden change in a normally constant quantity: a pulse of current; a pulse of radiation. b. Any of a series of intermittent occurrences characterized by a brief sudden change in a quantity.
Some pregnant women experience a metallic taste in their mouth during the early stages of pregnancy, because of the hormone changes. It's also fairly common to crave certain foods, or go off certain foods, and have a heightened sense of smell. Learn more about the signs and symptoms of pregnancy.
Discriminating Tastes. A pregnant woman really is eating for two, and the quality of what she eats matters as much as the quantity. Taste buds develop in a fetus around the seventh or eighth week and, by week 14, there is some evidence to suggest he can taste bitter, sweet, or sour flavors in the amniotic fluid.