I do agree with the article that a infants brains can be affected if they come from a broken home or dysfunctional family. I think how you are brought up plays a major part in your life and education, if you aren't brought up in a stereotypical normal family then I can see why it could affect infants brains as they are influenced by they're parents, for example living with a male could affect the way you speak and living with just a female could also. Having issues at homes such as arguments can affect you as taboo language can be used and from a young age you could think swearing was appropriate and normal.
The purpose of the text is to inform the reader about this issue affecting infants. The register is formal as this is a serious matter, we can tell this because the mode is a newspaper article and the graphology is plain and simple showing that it is formal.
