Sex ratios at birth vary across populations and over time. The study reviews evidence of very low sex ratios in Bantu populations using demographic survey data and vital registration data from Eastern and Southern Africa. Results based on a large number of births from 17 countries indicate that on average Bantu populations tend to have slightly more female births than male births (sex ratio = 0.989), contrary to populations of West Africa and to other populations in the world where more male births occur than female births.