A three-month-old female baby was diagnosed by roentgenograms as having bilateral multifocal ossification of the os calcis. Five ossification centers in the bilateral calcaneus were recognized. However, at one year of age the roentgenograms showed only three ossification centers, with cleft separating on both sides the anterior third from the posterior two-thirds of the bone. At two years of age, the three ossification centers had coalesced into a single composite ossification center and the cleft at the calcaneus disappeared.