Until a high-functioning child is 3 years old, it may be tricky to identify a difficulty in communication. However, as they age, parents will have a better understanding and explanations of certain social behaviors, such as, how their child relates and interacts with others. For example, it is possible for parents to
notice that their child, although able to fully communicate at home, may have a harder time around strangers or new environments. It is common for people to think that they are shy or, in a more serious case, suffers from autism.
In addition, it is possible that a child may suffer from selective mutism, which is an anxiety disorder that makes a child go silent when they are uncomfortable. Kids with autism, on the other hand, will struggle in social situations in general, whether they are comfortable or not.