"The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people."
The burden is on you to prove that the framers specifically intended to exclude a certain subsection of what you have already admitted are biological persons.
It certainly isn't in the text of either the Fifth or the Fourteenth Amendments.
"No State shall deprive any person of life without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.""No person shall be deprived of life without due process of law."
No exceptions to be found there.
Did they count them in the census? If they considered them "persons" then they're entitled to representation. If they don't get counted then they're being denied representation.
What did they consider the "0 point" of a person's age, when they were first recognized as a person?