The inability to correctly produce speech sounds (phonemes) because of imprecise placement, timing, pressure, speed, or flow of movement of the lips, tongue, or throat.

A receptive language disorder is one in which a child struggles to understand and process the messages and information they receive from others. 

Persistent difficulties with the use of verbal and nonverbal language for social purposes. Primary difficulties may be in social interaction, social understanding, pragmatics, language processing, or any combination of the above. Social communication behaviors such as eye contact, facial expressions, and body language are influenced by sociocultural and individual factors.

A fluency disorder is an interruption in the flow of speaking characterized by atypical rate, rhythm, and disfluencies (e.g., repetitions of sounds, syllables, words, and phrases; sound prolongations; and blocks), which may also be accompanied by excessive tension, speaking avoidance, struggle behaviors, and secondary mannerisms.

Feeding disorders include problems with sucking, eating from a spoon, chewing, or drinking from a cup. Swallowing disorders, also called dysphagia, are difficulties with moving food or liquid from the mouth, throat, or esophagus to the stomach.

A voice disorder includes any disturbances in loudness, pitch or quality. A resonance disorder is a disturbance in how the airflow is shaped as it moves through the mouth and through the nose.

Occurs when a child makes predictable and typical patterns of speech sound errors. The mistakes may be common in young children learning speech skills, but when they continue past a certain age, it may be a disorder.

An expressive language disorder is one in which the child struggles to get their meaning or messages across to other people. Some children have a mixed receptive-expressive language disorder in which they have symptoms of both types of disorders.

A neurological childhood speech sound disorder in which the precision and consistency of movements underlying speech are impaired in the absence of neuromuscular deficits.

Dyslexia is difficulty with reading despite instruction and without coexisting intellectual, sensory, or neurological difficulties. A person with word recognition deficits typically has relatively intact language comprehension but may have difficulties with accurate and/or fluent word recognition and poor spelling.

Augmentative and alternative communication (AAC) can include different systems, such as picture systems, gestures, manual signs, or speech-generating devices. These systems may be used to support existing speech and language or as a replacement for non-functional speech.