I remember reading studies from my undergrad days that said just the opposite was true
Lies, damn lies, and statistics being used by eugenists
“Lies, damn lies, and statistics being used by eugenists”
There are scientific studies (which almost never rely solely on statistics) and then there are polemics. This is an example of the second. Today many intelligent people opt to have small families in the more developed countries. Therefore the statistical findings indicate no cause dealing with the size of the family.