I was thinking of the particular kind of individualism promoted by Locke, which tends to lead to viewing persons as property. What you say is correct. There are two separate individuals, or persons, mother and child. A child is not the mother's property, and for that matter her body is not her property either.
Private property is an important property, but unless you believe in slavery property cannot be extended to persons. Indeed, the Declaration of Independence speaks of an inalienable right to life and liberty, which means we cannot sell ourselves even if we choose to.
Nor can we kill ourselves. How can we terminate a child in the womb constitutionally, but not be allowed to terminate our own life? One is abortion, the other is suicide. One is constitutionally acceptable, the other is illegal?????