The resource offered by the American Speech-Language-Hearing Association is an article to help parents understand what they might be observing in their child/children:
https://www.asha.org/public/speech/development/speech-and-language/
“Speech and language are different. A person can have problems with one or both. Learn about the difference here. See a speech-language pathologist, or SLP, if you have concerns.” – American Speech-Language-Hearing Association