Childhood vaccination has lagged in countries like India, despite its demonstrated positive effects on health outcomes like infant mortality. At the same time, many conditional cash transfer programs have been effective in improving health outcomes. We estimate the effect of the world's largest maternal health program, Janani Suraksha Yojana (JSY, maternal protection scheme), on childhood vaccination in India. We exploit exogenous variations in the expansion of the policy around the country and the fact that some key vaccines are given at or near birth to identify the effects of cash‐based maternal health policy on infant immunization. We find that JSY increased the probability of Bacillus Calmette–Guérin (BCG) and diphtheria, pertussis, and tetanus toxoid (DPT) vaccination among newborns and infants. However, we find almost no significant effects on the measles vaccine, which is administered several months after birth.