This chapter sheds light on the future of contraceptive use and fertility reduction in the context of international medical cooperation in Laos. The authors conducted a survey on differences in fertility behavior and contraceptive use by generations among married women aged 18 years and older in NK village, MN district, northern Laos in 2019. The analysis revealed a clear generational decline in fertility in NK village. First, young adults in their 20 s and 30 s had statistically significantly lower numbers of births and surviving children than older adults in their 40 s and older. It was also found that the proportion of contraceptive usage-experience was statistically significantly higher among the younger generation than that of the older one. The type of contraceptive used was either oral contraception or injectable contraceptive hormones, regardless of the generation. The fertility level in NK village is already at a level where further decline should be feared. Thus, the impacts of the government's commitment to expanding the use of long-acting reversible types of contraceptives need to be carefully evaluated should the replacement level of fertility be maintained. In addition, from the perspective of reproductive health and the rights of women, it is better to promote those methods of contraception that allow women to be more in control of their bodies rather than types of contraception that require more intensive medical intervention.