The baby’s sternum may have a relationship with rickets, sternal developmental deformities. 1. rickets: sternal ectopia may be caused by rickets, you can take your baby to the hospital to take blood tests for calcium, and then according to the baby’s comprehensive situation to determine whether there is rickets. 2. Sternal developmental deformity: congenital causes, such as sternal developmental deformity, this situation can usually be found at birth. The baby’s sternum may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease and then targeted treatment, usually pay attention to the posture, appropriate sun exposure, if the lack of calcium need to supplement calcium in a timely manner, is conducive to growth and development.