From birth to 2 years of age, infants with Prader-Willi Syndrome (PWS) typically exhibit early behavioral and physical diagnostic signs, most notably a pronounced lack of muscle tone and poor sucking behavior.

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In addition to genetic testing, Prader-Willi Syndrome (PWS) can be diagnosed using several behavioral criteria that manifest over time. These criteria include early physical signs in infancy, developmental delays during childhood, and later-onset cognitive deficits and excessive eating behaviors.

Behavioral Diagnostic Criteria for Prader-Willi Syndrome (PWS)

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Early Signs of Prader-Willi Syndrome (PWS)

Between the ages of 6 and 12, children with Prader-Willi Syndrome (PWS) typically experience noticeable developmental delays. Later in their development, they usually begin to present with cognitive deficits and excessive eating habits.

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