The term "fetal" refers to anything related to a fetus, which is the developing stage of a mammal after the embryonic phase. In humans, this stage begins around the ninth week of pregnancy and continues until birth. During this time, the fetus undergoes significant growth and development, forming essential organs and systems. Fetal development is crucial for the health of the baby and can be influenced by various factors, including maternal nutrition and environmental conditions. Medical professionals often monitor fetal health through ultrasounds and other assessments to ensure proper growth and detect any potential issues early in the pregnancy.