This study is recruiting parents of boys from birth up to 84 months of age (before the child's 7th birthday) to complete online questionnaires about their son's behavior and development.

If you have more than one son in this age group with Duchenne Muscular Dystrophy (DMD), please complete the questionnaire for your youngest son with DMD. Once you have completed the first set of questionnaires, you are welcome to re-enroll and complete the questionnaires again for each of your sons with DMD under 84 months (7 years) of age.

If your son does not have DMD and you have been referred to this study by a parent of a boy with DMD, please make sure that you complete all questions based on your son that is closest in age to his peer with DMD.

Parents of boys without a diagnosis of DMD under 84 months (7 years) of age are also welcome to complete the questionnaires, even if they have not been referred by a parent of a boy with DMD.

Thank you for your interest in this online study.

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/^((29([-\/])02\3(\d{2}([13579][26]|[2468][048]|04|08)|(1600|2[048]00)))|((((0[1-9]|1\d|2[0-8])([-\/])(0[1-9]|1[012]))|((29|30)([-\/])(0[13-9]|1[012]))|(31([-\/])(0[13578]|1[02])))(\11|\15|\18)\d{4})) (\d|[0-1]\d|[2][0-3]):[0-5]\d$/
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/^(((\d{2}([13579][26]|[2468][048]|04|08)|(1600|2[048]00))([-\/])02(\6)29)|(\d{4}([-\/])((0[1-9]|1[012])(\9)(0[1-9]|1\d|2[0-8])|((0[13-9]|1[012])(\9)(29|30))|((0[13578]|1[02])(\9)31)))) (\d|[0-1]\d|[2][0-3])(:[0-5]\d){2}$/
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