Bone age is generally evaluated by taking X-ray bone films of the left hand and wrist in conjunction with the development of the carpal, metacarpal, and phalanges. In infants, there is no ossification center in the wrist at birth, and the capitate and hook bones appear at about 3 months; the lower radial epiphysis appears at about 1 year of age; the triangular bone appears at about 2 and a half years of age; the lunate bone appears at about 3 years of age; the large and small polypus bones appear at 3.5-5 years of age; the navicular bone appears at 5-6 years of age; the lower ulnar epiphysis appears at 6-7 years of age; and the bean-shaped bone appears at 9-10 years of age. Carpal bones appear in full at age 10 years totaling 10. The age at which normal ossification centers appear varies, so caution and objectivity are needed when evaluating bone age.