1. Down Syndrome children often have smaller mouths and higher palates which makes their tongues protrude from their mouth. They can also have narrower airways which can cause respiratory problems and may lead to them breathing through their mouths instead of their noses.
3. Children with ADHD can blurt out inappropriate comments before they even realise that they have said them. They are also prone to showing their emotions without restraint which can lead to teasing or bullying.
Hopefully I have not generalised too much and there is some food for thought in these points. If I am missing anything important, please feel free to post a comment on this page and I will add them to this post.