Young children often experience intense emotions that they may be unable to communicate fully using verbal communication. Despite a lack of ability to effectively communicate their feelings, significant mental health problems can and do occur in young children. Children can demonstrate clear characteristics of anxiety disorders, attention-deficit/hyperactivity disorder (ADHD), and neurodevelopmental disabilities, such as autism, at a very early age. The earlier adults are able to detect these characteristics and implement intervention and support services, the greater the outcome. In fact, according to the Center on the Developing Child at Harvard University, “Most potential mental health problems will not become mental health problems if we respond to them early.” For this reason, prevention and early intervention are key to promoting positive Infant and Early Childhood mental health (IECMH).