Take a look at this great website which also includes an app!
It has some lovely videos showing how "Right from the beginning babies want to be social and interact" and that the interactions the baby sets up and experiences has a long-term impact on the way they develop. The theory underlining this research and outlined in the Warwick Infant and Family Wellbeing Unit, site is designed to help mums and dads become confident in what they notice about their own baby.
The app includes short videos of babies in the sleep states – deep sleep, light sleep and drowsy sleep – and wake states – crying, unsettled and quiet alert so that you can identify your own babies patterns and you can personalise the app by uploading photos of your baby in each of the six states recording their 'likes and dislikes."
Of course if you are worried about your child's talking then what you may notice is that your child seems to have found it trickier to give clear signals than the babies in the videos on this site. This made it harder for you to know how to respond and will have affected the balance of interaction between you. VERVEing helps your child to show clearer signals and allows them to sort out their rhythm of interaction - firstly with you and then with others, slotting back to the synchrony of interaction outlined at your baby org.
Posted by Jo