The early symptoms of rickets are mainly due to the inadequate intake of vitamin D in children, leading to disturbances in the body's calcium and phosphorus metabolism. Early signs usually appear around three months of age in infants, characterized by changes in mental state, restless sleep, frequent crying, and excessive sweating. Increased sweating is often accompanied by cradle cap, where circular bald patches appear on the back of the head. In such cases, it is important to include vitamin D-rich foods in the diet and supplement with vitamin D. Continued breastfeeding, engaging in outdoor activities, and exposure to sunlight are recommended to promote the body’s own synthesis of vitamin D. Regular physical examinations are also advised, and if symptoms of rickets occur, an appropriate increase in vitamin D intake may be necessary.