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3. Physical Characteristics in Males

The physical characteristics of FXS may not be apparent in infants or young children. Individuals rarely exhibit every trait, and some men have no physical indicators of FSX at all. Physical traits include a long face, weak muscle tone, highly arched palate in the roof of the mouth and overly large ears. Connective tissue abnormalities manifest as flat feet, hyper-flexible joints, double-jointed fingers, and soft skin. Enlarged testes, known as macroorchidism, develop during puberty.

Fragile X syndrome children

Steve Debenport / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.