Science already has the technology to test for the sex of an embryo as early as eight cell developments (roughly around day 3, also known as the cleavage stage). This test can be done through a procedure called In Vitro Fertilization (IVF), in which egg cells are fertilized by sperm outside the womb.

Preimplantation genetic diagnosis (PGD) was originally developed for reasons unrelated to embryo sex selection. The initial cause for developing various types of embryo tests was to detect genetic diseases that a baby could inherit from its birth parents before pregnancy.  Couples or individuals who test positive for serious genetic disorders such as cystic fibrosis or other genetic diseases can investigate whether their child will share the same condition through these embryonic tests and determine if pregnancy is the right decision for them.

While the opportunity of sex selection is a result of PGD, it is rarely used for this purpose. It is also a very costly treatment (a single round of PGD can cost nearly $20,000). The procedure is invasive and can be painful; and unless needed for reasons other than infertility or known genetic defects, it can be an expensive investment.

If you’re determined to choose the sex of your unborn baby, you’ll have to meet strict eligibility requirements. Some clinics that perform the procedure only accept married couples that already have at least one child of the sex opposite to the one they’re trying for.  Other clinics have age limits or require you to take hormone tests to prove you’re not approaching menopause.

And of course there is a moral debate surrounding the idea of embryonic testing.  Some say that PGD helps parents make educated decisions about pregnancy and assist with planning for their future.  Others argue that it should be left to nature to navigate the proper balance in the world.  After all, we are only human…