Cold weather can significantly impact prenatal nutrition and vitamin D levels, making it essential for pregnant women to take extra precautions. Limited sun exposure during winter reduces the body’s ability to naturally produce vitamin D, which is crucial for fetal bone development and immune health. Deficiency can lead to weaker bones, fatigue, and increased pregnancy complications. Additionally, colder months may encourage heavier, carb-rich diets while reducing the intake of fresh fruits and vegetables, leading to potential nutrient imbalances. To counteract these effects, expecting mothers should include vitamin D-rich foods, supplements (if prescribed), and safe outdoor exposure to support a healthy pregnancy.