How do speech, language and communication skills develop?

For example, the development of speech sounds is at the very top of the pyramid, but in order to develop this, there needs to be good attention and listening, and practice during conversations in place, and they must understand the words they are trying to produce. Speech Therapists work with children who might be struggling with any of these areas.
The following websites have more information about how speech and language skills develop:
- Ages and stages - Speech and Language UK: Changing young lives
- BBC Tiny Happy People - Child development and milestones
