The Federal Reserve Bank of St. Louis studied the work productivity of women over a 30-year career and found that mothers outperformed women that did not have kids. What’s more, moms with two kids or more did best.
The effect is similarly true for men that are fathers vs. men with no children.
Not surprisingly, the period when women have young children at home is the stretch where their work productivity declines by 15 to 17% on average. Each preteen child adds a 10-12% drop in total productivity.
However, moms make up for that less productive stage by outperforming before having kids and after the children become teenagers.