This study aimed to test the applicability of the New Home Economics Model in explaining Thai fertility behavior. Attempts had been made also to see how the change in fertility behavior during a decade of 1969-1979 could be explained by the change in its determinants particularly the growth in economic factors. The study used the data from the National Survey of fertility, Mortality and Family Planning in 1979 to analyse the cross-sectional fertility behavior in 1979. The results were then compared with those obtained for the year 1969-1970 and 1972-1973 from the earlier study. The method used simply a comparative-static with multiple regression and path analysis technique as statistical tools. The results clearly showed significant changes in the parents' substitution between child quantity and quality. Thai family chose to have smaller size while increasing their children's quality of life. Other economic factors still maintained their influence upon fertility during the decade under study.
