I have now removed the unwanted material on child acquisition from the Wikipedia article on English Phonology. In the end, the best place for this sort of information is the article on Phonological Development , so I've added a link to that. That doesn't resolve the duplication I mentioned in my last post, but at least the article on English Phonology is not involved any more (I hope).
A blog that discusses problems in Wikipedia's coverage of Phonetics
Emeritus Professor of Phonetics,