In this presentation, I draw from a variety of sources a picture of current trends in the sex ratio at birth across the world. This comparison illustrates the variety of situations and recent trajectories in birth masculinity in countries affected by prenatal sex selection. After a brief reminder of the process of demographic masculinization, I will examine the few demographic, social, and economic invariants found across countries affected by the rise in sex-selective abortions and ponder on what they tell us of the future of sex imbalances. Similarly, I will look into the specific patterns of changes in the sex ratio to identify specific trajectories that may help us decipher the future of skewed sex ratios and of missing females.