A 2-year-old baby with depressions on both sides of the head may be caused by malnutrition, abnormal skull development and calcium deficiency. 1. Malnutrition: Inadequate feeding or picky eating of 2-year-old babies can lead to insufficient intake of nutrients, resulting in severe malnutrition of 2-year-old babies with extreme wasting, which will be manifested by the sunken head on both sides. 2. Abnormal skull development: it may be a congenital cause of defects in the skull area of 2-year-old infants, resulting in two sides of the concave, but the degree of concavity is often not the same. 3. Calcium deficiency: Due to the long-term calcium deficiency of 2-year-old infants, resulting in the softening of the skull, the two sides of the head may appear to have depression, accompanied by excessive sweating, head shaking and other symptoms. When 2-year-old infants have depression on both sides of the head, it is recommended to go to the pediatric department of the regular hospital in time to avoid delaying the condition.