Well, since it wasn't articulated at the onset, the presumption I had was this was something in America. Yeah, so I'm not an internationalist. I can live with that.
The basis on nationality is important, since some nations have inherent, normally religious, views that sons are more important/preferable. In those countries, good luck trying to make such illegal, especially if abortion is legal. Which in India's case, I'm really not sure if it is or not. If it is, it's up to them to change the laws.
Which makes the question of illegality/criminality moot. We all make our beds, and in those beds we must sleep. They chose this course of action, let them reap the consequences.