Occipital baldness may be a sign of calcium deficiency or may be due to other causes. Occipital baldness is a condition in which a circle of hair is sparse or absent on the occipital area, i.e., the area where the head touches the pillow. Babies often sweat when they sleep, and the pillow becomes wet with sweat and becomes uncomfortable, so babies will shake their heads from side to side to relieve the discomfort. In addition, inadequate nutrition during pregnancy can lead to pillow baldness in infants. Calcium deficiency, or even vitamin D deficiency rickets, can also lead to the phenomenon of occipital baldness in infants. Parents can take their infant to the pediatrician for a checkup to determine the blood calcium level by examining trace elements to determine the specific cause of occipital baldness and to provide symptomatic treatment.