The average number of children a woman will have during her lifetime The total fertility rate in developing countries is between three and four; in industrial countries it is less than two
General fertility rate is the number of births a year per 1,000 women aged 15 to 44 Total fertility rate is the number of live births per 1,000 women in their lifetime
Completed Fertility Rate The average number of children born to women during the childbearing years of 15 to 44 Period Fertility Rate A single-year picture reflecting each female cohort's childbearing potential, which is subject to fluctuation based upon short-term social and economic trends This rate is used in the annual calculation of live births