I think it would be useful to have a tag for speech that is meant to be used when talking to young children. For example, "How to tell a child that he did something wrong" could benefit from such a tag.
This tag would be similar to the dialect tags, in that it describes a specialized form of English that is used by an easily defined category of people. In this case, the category is children between 3 and 7 years of age. They have limited vocabularies. Does anyone have suggestions for a good name for this new tag?
baby-talk is obviously inappropriate. Baby-talk is often inarticulate, and is not meant to be a strict subset of English proper.