Maybe Peita is thinking of the parenthood penalty papers, where women but not men show a decrease in earnings?

Admittedly, a lot of the papers that are cited now tend to be pretty old, and things have changed a lot.

But here's a fairly recent one as an example: https://www2.census.gov/ces/wp/2017/CES-WP-17-68.pdf

See Figure 2 (but also the 1990 birth cohort line of Figure 4, and please also forgive them for not recognizing that with data like that you need to regress on age; and also Figure 9 to help disambiguate different tentative explanations).