Unraveling Growth: Analyzing the key Factors Influencing growth rate of children under two years

Introduction: According to the significance of children in the culture, economy, and human resources for the country's future, their growth in the first 2 years and its influencing factors are crucial for the country's progress. Objectives: The study evaluates the determinants that impact the growth of children in their first two years of life. Methods: This data was collected based on electronic files from 601 children who visited Health Service Centers in North Khorasan province from April 2020 to April 2023. We used longitudinal models (transmission-random-marginal) and SPSS software version 26. We employed the Akaike information criterion, with a significance level of 0.05. Results: Based on our research, we found that the recommended growth measurements for weight, length, and head circumference for children under 2 years using the longitudinal method. Children's growth was significantly associated with gender, place of residence, mother's education, type of breastfeeding, intrauterine age, singleton birth, and mother's weight (P