80 Beats at Discover Magazine has a great summary of the new blood test that lets parents know the sex of their baby as early as 7 weeks into the pregnancy. The highlights:

Sex selection is, in my analysis, ethically permissible. But just because something is permissible doesn’t mean it makes sense. Outside of family balancing or to prevent some hereditary/genetic disorder, why in the world would you sex select? I mean, I get that cultural prejudices cause people to make stupid decisions, but that’s not so much a reason as it is an excuse. Fears over sex selection are a reflection of a deeper concern over cultural norms around sex and gender. Only a problematic set of systemic cultural values can make sex selection into a problem.