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You are seeing a 12-month-old baby in clinic with the child’s mother and father who are of black African origin. The mother has brought her child in because she is concerned that the babies’s bones in the hands and feet are swollen. This has happened a couple of times before and there is now visible shortening of a couple of fingers on the babies left hand. They are concerned and what to know what is going on. What is your most likely differential diagnosis?