A 4-year-old boy presents with a complaint of difficulty while walking. He began walking at 16 months of age, but he was clumsy and fell frequently; a pediatrician reassured his parents that he would “outgrow it.” He remains clumsier than his peers, falls during simple tasks, and has developed a “waddling” gait. He has experienced increasing difficulty getting up from a sitting position on the floor within the last month. What is your diagnosis for this boy?
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