It’s common for media and academics to cite the statistic that China’s one-child policy has led to anywhere from 30 million to 60 million “missing girls” that has created a gender imbalance in the world’s most populous nation. But a new study that has found those numbers are likely overblown and that a large number of those girls aren’t missing at all — it was more of an administrative story that had to do with how births are registered at local levels in China.