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Health is the necessary foundation for the comprehensive development of children. Unhealthy nutritional status of children in all its forms is a global problem. Our research goal was to assess prevailing nutritional status and changes in it among pre-school children in the north of Vietnam. There were several stages in the examination, each performed once a quarter, from September 2017 to March 2018. The results showed that children's height and weight grew. At the initial stage of the examination average age of children was equal to 42 months, average weight and height were 14 kg and 95 cm respectively. At stage 2, average height and weight were equal to 14.2 kg and 97 cm, and at stage 3 they were 15 kg and 99 cm, respectively. All the applied models revealed the correlation between anthropometric indices of children aged 10–60 months and their age (p < 0.05), however, only the model y = 0.2736x + 2.8943 with R2 = 0.8571 revealed a tight correlation between body mass index and age. We applied the WHO standards (2006) to assess the nutritional status of children. After 6 months of the examination we detected an increase in number of children with good nutritional status and a decrease in number of those with bad one that was the most tightly connected with malnutrition. At stage 3 we revealed 15.7% children with stunting, 4.3% children with underweight, and 3.3% with both disorders, among those who received insufficient nutrition. 1.5% children suffered from hypotrophy; and 0.1% children had underweight, stunting, and hypotrophy. Prevalence of overweight and obesity didn't decrease as at stage 1 over-weight was detected in 4.5% cases, and obesity, in 1.2% cases; and at stage 3, they were detected in 5.5% and 1.1% cases respectively. Apart from that, in some cases malnutrition and disorders related to overweight occurred simultaneously: stunting and overweight in 0.6% cases, stunting and obesity, in 0.1% cases.