Which physical feature is NOT commonly associated with Down Syndrome?

Large fontanels are not commonly associated with Down Syndrome, which is a genetic condition resulting from the presence of an extra chromosome 21. The physical features typically linked to Down Syndrome include a short neck, protruding tongue, and hypotonia, all of which are observed in many individuals with the condition.

Short neck is seen due to the generalized hypotonia affecting the neck muscles, leading to decreased muscle tone and appearance. The protruding tongue is a characteristic feature that can occur due to the size of the tongue relative to the oral cavity, as well as the hypotonia affecting muscle control. Hypotonia, or reduced muscle tone, is a hallmark of Down Syndrome and contributes to various developmental challenges, including motor skills.

In contrast, large fontanels are not a defining characteristic of Down Syndrome. While some infants with Down Syndrome may have larger than average fontanels, especially at birth, this feature is not specific and can be found in various other conditions and contexts.