 Of course, as Heyd notes, in many cases an act that creates a low wellbeing level for a person whose existence depends on that act will also create low wellbeing levels for people whose existences are independent of that act. If an agent buries glass in the wood prior to conceiving a child, then even if that act affects the timing and manner of conception and thus (according to the logic of the nonidentity analysis) would not make things worse for the agent’s own child, that act might still make things worse for a neighbor’s child. On that ground, the act can be declared wrong (Heyd 1992, 193–203). The choice of wrongful life, as well, can have deleterious effects on people other than the impaired child – burdens, in other words, that the impaired child itself will then be required to share (Roberts 2009a).