During pregnancy, women need essential nutrients crucial for fetal development and maternal health. Key nutrients include folic acid to prevent neural tube defects, iron to support increased blood volume, and calcium for developing strong bones. Adequate intake of protein is also vital for cell growth, while omega-3 fatty acids play a significant role in brain development. Additionally, staying hydrated and consuming a variety of fruits and vegetables provides necessary vitamins and minerals, ensuring both the mother and baby maintain good health throughout the pregnancy journey.