This analysis looks at the costs and benefits of adding family planning services to programs for the prevention of mother to child transmission of HIV in fourteen high HIV prevalence countries. The benefits of PMTCT programs are discussed. They are further enhanced by the addition of family planning services which by 2007 could avert an additional 55,000 child deaths, save 7,000 women’s lives through a combination of fewer births and better birth spacing and avert 155,000 potential orphans. Family planning can double the impact of PMTCT programs in reducing HIV+ births and can have an even larger impact on reducing child and maternal deaths. The cost of adding family planning to PMTCT services is only about $360 per child death averted.