Children's savings accounts (CSAs) are being promoted to improve financial literacy, increase the number of low- to moderate-income households that are banked, and encourage saving for education, homeownership, or retirement. This study uses projections from the Urban Institute's DYNASIM model to estimate the wealth building impact of CSAs. The results suggest that most CSAs will have small balances after accounting for inflation. Still, such accounts could help get children, particularly those in low-income families, into financial instruments that demonstrate the value of saving and of compound interest.