Speech-Language Pathology professionals (Speech-Language Pathologists (SLPs), or informally speech therapists) specialize in communication disorders as well as swallowing disorders.

The main components of speech production include: phonation, the process of sound production; resonance; intonation, the variation of pitch; and voice, including aeromechanical components of respiration. The main components of language include: phonology, the manipulation of sound according to the rules of the language; morphology, the understanding and use of the minimal units of meaning; syntax, the grammar or principles and rules for constructing sentences in language; semantics, the interpretation of meaning from the signs or symbols of communication; and pragmatics, the social aspects of communication.

Below are several podcast showing what a speech therapist does:

Infant Feeding skills - Breast vs Bottle Language and Literacy Eureka Approach The R Sound
SLP CFY what to expect first year toy-suggestions-speech-motor-part-1 Nancy Kaufman Apraxia
Speech Therapy Developmental Milestones Top_5_Speech_therapy_iPad_apps Language Therapy video podcast