Children's nutritional status has been recognized as an important indicator that can reflect the developmental status of this age group, as it describes important results for detecting current nutritional status and its objective is to prevent possible changes in children's development. The aim of this research was to analyze and compare the nutritional status of children from 0 to 5 years of age from the town's Public Day Care Centers in Foz do Iguaçu, State of Paraná, Brazil -in 2017 and 2018. This is a descriptive and quantitative study, carried out with data obtained from the database of the City's Epidemiological Health Sector, considering the diagnosis of severe malnutrition, thinness, normal weight, mildly overweight, overweight and obesity. As a result of the analysis, a reduction in nutritional status was found in 19.1% of the children, an increase in 20.8%, and 60.1% of the children maintained the diagnosis of the previous year. Eutrophy values decreased in both genders in relation to the previous year, and there was an increase in the overall overweight and obesity rates. Data analysis highlights the process of children's nutrition transition, as it can also be an alert to the increase in overweight and obesity in this population.

We aimed to analyze the temporal trend of the nutritional status of children aged 0 to 5 years old from Brazilian international border line municipalities. Ecological observational and time series study, analyzed secondary data from the period 2009 to 2018, obtained from the public access reports of the Food and Nutrition Surveillance System of the Ministry of Health, through the Body Mass Index (BMI), using the indicators: marked thinness, thinness, eutrophy, risk of overweight, overweight, and obesity. Time trend analysis was performed using the Prais-Winstein regression test (SPSS program). The data were grouped according to the Northern, Central and Southern arches, totaling 891,013 children under 5 years of age. Children in the Southern arc had the highest percentages of risk of overweight (22.0%) and overweight (9.8%) and those in the Central arc had the highest percentages of marked thinness (3.2%), thinness (3.0%), and obesity (97.5%). The temporal analysis indicated a significant downward trend in extreme thinness and thinness of this public in the borderline municipalities of the Northern and Central arches and an upward trend in the risk of overweight in the Northern arch. It is concluded that there is a change in the nutritional profile of children aged 0 to 5 years in the analyzed municipalities with a reduction in the proportion of children with thinness and an increase in the risk of overweight.