Yes, it has been adjudicated that a child born of legal residents is a natural born citizen. Wong v Ark
You have been misinformed. The holding in Wong Kim Ark designates him as a "citizen." It never says "natural born citizen."
I've argued this point for over a decade. It's only two more words, but the court did not add them. They deliberately left out "natural born" in calling Wong Kim Ark a "citizen", and they make it clear that he is only a citizen because of the 14th amendment.
The 14th amendment citizenship is "naturalization at birth."