 Since Parfit first described the 14-year-old girl case, reproductive technologies have advanced. The option of cryopreserving gametes or newly formed human embryos now means that there is at least a theoretical possibility that the 14-year-old girl really could have produced the same child – or at least a child from the same gametes – many years later. Even so, the probabilities of the situation would need to be taken into account. Changing the manner of conception – moving, that is, from coitus to in vitro fertilization – would have surely meant that very probably it would have been a nonidentical (if better off) child who would have been conceived in place of the one. 