Can fertility be estimated from current pregnancy data?

This paper explores the feasibility of estimating fertility from reports on current pregnancies collected in single-round sample surveys. Data from 15 countries in the World Fertility Survey are used to evaluate the possibilities. The results indicate that neither the age pattern of fertility nor the total fertility ratio can be reliably estimated from current pregnancy data. For almost all countries, the total fertility ratio based on recent births is higher than that based on current pregnancies, even when the latter estimate is restricted to higher durations of pregnancy.