ALM Intelligence research on gender diversity indicates that women do not leave the law just to have children or raise a family.  Instead, there is a slow trickling-out of women from the Big Law workforce year-over-year. As seen below, women one year out of law school comprise 44% of the Big Law population, while women 25 years out of law school comprise only 25% of the Big Law population.

Figure 1: Percentage of Am Law 200 Lawyers by Gender by Year Post Graduation