Neither fetuses nor neonates possess a right to life. Therefore, neither abortion nor infanticide involves the violation of anyone's right to life. So unless there is some other sound objection to either abortion or infanticide, both practices are morally acceptable. A child does not have a right to smoke. A newspaper does not have a right not to be torn up.
P can be possessors of rights.
An entity's interests is a function of its present and future desires, both those it will actually have and those it could have. A cat does not have a right to a university education. A is capable of making an informed and rational choice whether to grant others permission to deprive him of X, in which case others are under a prima facie obligation not to deprive A of X if and only if A has not granted them permission to do so. The right to life refers to the right that a subject of consciousness has to continued existence. The concept of a right is such that an individual cannot have a right at time t to continued existence unless the individual is such that it can be in its interest at time t that it continue to exist.