104.5 boys are born for every 100 girls to offset boys’ greater probability of dying in infancy. Due to falling fertility, cheap ultrasounds, and son preference, baby girls are, in many parts of the world, rare. In India, the rate is 108 boys/100-females, in Armenia 116, in China 120! The gap rises with income and education as the wealthy usually have small families and are thus more desperate for boys!