I argue that it is wrong deliberately to bring into existence an individual whose life we can reasonably expect will be of very poor quality. The individual's life would on balance be worth living but would nevertheless fall below a certain threshold. Additionally the prospective parents are unable to have any other child who would enjoy a better existence. Against the claims of John Harris and John Robertson I argue that deliberately to conceive such a child would not be to exercise the right to procreate. For this right is internally constrained by the requirement that any resultant child has the reasonable prospect of a minimally decent life.