Facebook post by University of Helsinki

A gene that regulates the ratio between male and female babies has been found. The same study also supports earlier findings that male fetuses are more vulnerable to preeclampsia.
Researchers found a link between genes and preeclampsia – HLA-G gene regulates male-to-female ratio at birth | University of Helsinki helsinki.fi

The study strengthens earlier findings of the vulnerability of male fetuses to preeclampsia.