It’s a girl — again! And again! Why a baby’s sex isn’t random. - The Washington Post
- It’s a girl — again! And again! Why a baby’s sex isn’t random. The Washington Post
- A child’s biological sex may not always be a random 50-50 chance Science News
- Your chance of having a boy or girl may not be 50/50 New Scientist
- Having only boys or girls sometimes runs in the family. Here's why BBC Science Focus Magazine