Final answer:
In many cases of Prader-Willi Syndrome (PWS), diagnosis is prompted by physical symptoms in the newborn, particularly lack of muscle tone, poor sucking behavior, and difficulties with feeding.
Step-by-step explanation:
In many cases of Prader-Willi Syndrome (PWS), diagnosis is prompted by physical symptoms in the newborn, particularly lack of muscle tone and poor sucking behavior. These early signs of PWS can be observed from birth to 2 years of age. Another symptom that can lead to diagnosis is difficulty feeding. As the child grows older, developmental delays, excessive eating, and cognitive deficits associated with PWS may become apparent.