Pesticides, such as insecticides, fungicides, herbicides, and rodenticides, are a group of chemical compounds that have different actions. After their application, the degradation process is slow. They can remain in the soil and groundwater, contaminating the water. Climate change transforms the process of degradation of chemical compounds, by altering soil composition, producing alterations in the ecosystem and biodiversity. The impact of pesticides on human health is challenging because of the great potential for harm they have. Since 2004, genetically modified seeds have been introduced in Paraguay, accompanied by a great increase in cultivation areas and pesticide use. To review the current state of knowledge about the effects of these chemical substances on the different organs and systems in pediatric and pregnant populations, a descriptive review was carried out, utilizing the main available databases. As a secondary objective, considering the extension of cultivation areas in Paraguay, we also described the results of studies carried out in the country. The results of the reviewed studies show an association between the involvement of different organ systems in these populations and environmental exposure, water, and food. Some of these results are replicated in those carried out in the country's growing areas.