What would be the aggregate effects of adopting a more generous and universal childcare subsidy program in the U.S.? We answer this question in a life-cycle equilibrium model with joint labor-supply decisions of married households along extensive and intensive margins, heterogeneity in terms of the presence of children across households and skill losses of females associated to non-participation. We find that subsidies have substantial effects on female labor supply, which are largest at the bottom of the skill distribution. Fully subsidized childcare available to all households leads to long-run increases in the participation of married females and total hours worked by about 10.1% and 1.0%, respectively. There are large differences across households in welfare gains, as a small number of households -- poorer households with children -- gain significantly while others lose. Welfare gains of newborn households amount to 1.9%. Our findings are robust to differences among households in fertility and childcare expenditures. (author abstract)