Why do down syndrome kids stick their tongues out?

Children with Down syndrome may stick their tongues out for various reasons, including hypotonia (reduced muscle tone), which can affect oral motor control and lead to a protruding tongue. Additionally, they may have a smaller oral cavity or larger tongue relative to their mouth, making it more comfortable to keep their tongue outside. This behavior can also be a form of self-soothing or a response to sensory processing differences. Overall, it's a common characteristic and not necessarily a cause for concern.