Although your query, and writing, sell the article or story, I am of the school of thought that if you any
have experience in publishing, or teaching, you should mention it. The reason being, publishing experience shows that you
know how to take editorial direction and make deadlines. Teaching (or library) experiences show you know children.
In your case, I would suggest making the paragraph very short and very vague. Something like this:
I have had articles published in journals.
This question came up on SCBWI bulletin board and I advised as above. Another writer disagreed, but Harold Underdown --
book editor, and author of the Idiots for Children's Publishing book -- logged on and backed up my answer.