Final answer:
In the first trimester, a major developmental task involves the establishment of fundamental body structures, ensuring avoidance of harmful substances, and proper nutrient intake for embryonic growth.
Step-by-step explanation:
A major developmental task for a woman during the first trimester of pregnancy involves the laying down of the basic structures of the body, including the development of limb buds, heart, eyes, and liver. During this time, it is crucial for the mother to avoid toxic substances and ensure a proper intake of nutrients, especially folic acid (vitamin B9), calcium, iron, and omega-3 fatty acids. These are critical for the normal growth and development of the embryo. As pregnancy progresses into the second and third trimesters, the focus shifts to the continual growth and maturation of all organs and systems, with the placenta taking over the functions of nutrition, waste elimination, and hormone production.
By the third trimester, the fetus experiences the most rapid growth, preparing for the labor and delivery stages. Understanding these physiological changes is important for expectant mothers to provide the best possible environment for the developing fetus.