Which of the following describes Pervasive Developmental Disorder (PDD)?

Pervasive Developmental Disorder (PDD) encompasses a range of developmental disorders that are characterized primarily by significant delays in socialization and communication skills. These delays manifest in various ways, including difficulties in understanding social cues, engaging in age-appropriate interactions, and developing effective communication strategies. PDD includes disorders such as autism spectrum disorder, which further highlights the importance of social and communicative aspects in understanding and diagnosing these conditions.

The other options presented do not accurately reflect the key characteristics of PDD. While some may relate to different medical conditions, such as muscular disorders or effects from prenatal exposure to substances, they do not adequately capture the essence of PDD as it pertains to social and communicative deficits. Additionally, while some genetic disorders can be present at birth, they do not define the specific social and communication delays central to the diagnosis of PDD. Therefore, focusing on the delays in socialization and communication skills provides a clear and accurate understanding of Pervasive Developmental Disorder.