Please read the literature on a syndrome before you comment please. You can not talk about a condition based on two people. Children with down syndrome in "most" cases do not understand the concept of personal space, appropriate times to show affection and to what degree, among other issues which often includes speech and therefore feeding. But yes they can be taught the limits but my point is they don't come naturally to the children. They will learn functional skills with help and depending on if their condition is pure or mosaic from a genetic standpoint will determine to what extent their mental processing of the learning tasks will be affected.