There is no obvious difference between the performance of baby’s occipital baldness circle and calcium deficiency circle, calcium deficiency is one of the causes of occipital baldness. There are many reasons for the formation of occipital baldness ring, including physiological reasons, such as the baby lying down for a long time, its pillow due to sweating, friction and other reasons for the reduction of hair and slow growth; pathologic reasons, such as lack of calcium led to the baby’s nervous excitability increases, easy to irritate, sweaty and frequent shaking of the head and the emergence of occipital baldness ring and so on. If it is caused by physiological reasons, it can be improved by timely replacement of comfortable pillows or improved with age. If it is due to pathological reasons such as calcium deficiency, it should be treated with vitamin D supplementation or calcium supplements. If your child has thinning hair, lack of hair or other abnormalities, it is recommended that you consult a doctor as soon as possible for a definitive diagnosis, and take vitamin D or calcium supplements under the guidance of a doctor.