It's not just children. The august body of the "supreme" court seems to have trouble knowing just what a "person" is.
This in not only evident in Roe vs. Wade where the old gummers who were so senile they couldn't even control their bowels said that an unborn child isn't a human being, they also said that a black person is not a human bieng either, in The Dredd-Scot decision, which has never been vacated/overturned.
excerpt:
This case was overturned by the 13th Amendment, which abolished slavery altogether, and the 14th Amendment, which pronounced all persons born in the United States to be citizens of the U.S. regardless of color or previous condition of servitude. Also, this case was the first to employ the substantive due process clause which would be referred to again later in many other cases.
And here
excerpt:
It is one of only four cases in U. S. history that has ever been overturned by a Constitutional amendment (overturned by the 13th and 14th Amendments). It is also, along with Marbury, one of only two cases prior to the Civil War that declared a federal law unconstitutional.