Designer babies have hit a new milestone—they can come breast cancer-free.

Well, not exactly.

A British baby girl has been born without the BRCA1 gene that is linked to breast cancer. That in itself is not special, however, the embryo she grew from was specially selected for because it didn’t have the defective BRCA1 gene.

Her story made headlines and raised concerns about designer babies. As always, people are asking (or are afraid to ask), what’s next?

Technology is pushing us into unchartered waters where ethical grounds have not been laid down to determine how, and whether at all, people can choose the features of their unborn child.

A story in the Guardian asked, if given the choice, would couples opt to have a child without autism. It then followed with the hypothesis that such a pre-natal test would eliminate future geniuses, citing the example of the briliant British physicist Paul Dirac who was purportedly autistic.

It’s possible to imagine that techniques such as pre-implantation genetic diagnosis, which was used to select the BRCA1-free embryo, could be used to select against embryos with diseases that we know very little about and whose acceptance is culturally determind.

Science, tread carefully.