American women will have an average of 1.84 children in their lifetime, an estimate based on birth rates by age in 2015. This is well below the average of two children per woman required to sustain the U.S. population at its current size absent immigration. Here is the average number of children women will have in their lifetime by race and Hispanic origin...
Average number of children in lifetime
2.12 children for Hispanics
1.86 children for non-Hispanic Blacks
1.75 children for non-Hispanic Whites
1.65 children for Asians
1.26 children for American Indians
Source: National Center for Health Statistics, Births: Final Data for 2015