Once children are verbal and able to remember words and numbers, I make a point of teaching them to clearly articulate their name, phone number, and address. This of course relies on their memory. And it requires the child to use slow, deliberate speech, with pauses between words. This gives the listener the best chance of understanding what is being said.
I recently read an article that highlighted a main reason why we teach children to memorize their basic information. You can read it here (I recommend reading the story, not the video):
For a powerful resource to help your child speak
Jill Hicks is the mother of a child with Down syndrome and a speech-language pathologist. Her passion is to empower others to help people with Down syndrome.