Growth charts are important tools used to evaluate the growth status of children and estimate the nutritional and health status of the general population. In Korea, the national standardized growth charts were updated in 2017. However, the growth charts developed by the World Health Organization (WHO) are being adopted for children under 3 years of age despite a lack of evidence for their applicability to Koreans. Here we aimed to collect accurate physical measurement data, develop growth charts for infants and toddlers under 3 years of age based on breastfeeding, and evaluate the feasibility of adopting WHO growth standards as a reference in Korea. Beginning April 2020, six general and local hospitals were selected nationwide. Mothers and newborns without growth restriction-related factors were enrolled at birth, and they were followed up monthly until 12 months and every 3 months until 36 months. Data were collected on physical measurements
eating habits
childhood morbidity
perinatal factors
and socioeconomic, demographic, and environmental characteristics. All participating hospitals used the same standard equipment. The Korea Infant Physical Growth Examination Survey evaluated the suitability of the WHO growth charts and contributed to the next revision of the Korean growth charts. The results of this study provide a basis for developing health-related strategies for treating children in South Korea.