From the Pew research center: “Due to these diverging trends, dads now represent 18% of stay-at-home parents, up from 11% in 1989.” https://www.pewresearch.org/short-reads/2023/08/03/almost-1-in-5-stay-at-home-parents-in-the-us-are-dads/


7 Million Fathers are Primary Caregivers
according to the U.S. Census, 2011.
The U.S. Census reports that 32% of married fathers (approximately 7 million dads) are “a regular source of care for their children under age 15, up from 26% from 2002.” The U.S. Census defines “regular care of children” as an arrangement that is consistent at least one day per week.

https://www.census.gov/newsroom/releases/archives/children/cb11-198.html