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Delayed closure of the anterior fontanelle beyond 18 to 24 months is a notable symptom.The image provided shows a small, low-resolution view of a child's lower legs from behind on a purple mat, but the image clarity is insufficient to determine if any genuine bone curvature or bowing is present.An open fontanelle at two years shares characteristics with conditions like nutritional rickets, congenital hypothyroidism, or normal biological variation.To investigate further, a pediatrician will typically order a serum
alkaline phosphatase test, look for widened wrists, and examine the child's gait.