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childhood obesity is a public health problem whose prevalence has grown steadily in recent decades. to describe the weight status of schoolchildren aged 6 to 9 years in Spain in 2019, and their associated factors. ALADINO is a cross-sectional study in schoolchildren aged 6 to 9 years, representative of the Spanish population, and aligned with the Child Obesity Surveillance Initative of the WHO Regional Office for Europe. Participants' weight, height, and abdominal circumference were measured, defining weight status according to different standards (WHO, IOTF, and Orbegozo). A questionnaire on lifestyle and socio-demographic characteristics was administered to parents. a total of 16,665 schoolchildren from 276 schools were measured. Excess weight was observed in 40.6%: 23.3% overweight and 17.3% obesity, with obesity being more prevalent in boys and overweight in girls, both increasing with age. The prevalence of abdominal obesity was 22.6%. Excess weight decreased by 3.9 percentage points since 2011, mainly due to overweight in boys. Obesity remained stable. Excess weight was more prevalent in schoolchildren with less healthy eating and physical activity habits, and in families with a lower socioeconomic status. the prevalence of excess weight is high, although it has declined since 2011 and remains stable since 2015 among schoolchildren aged 6-9 years in Spain, this reduction being mainly due to a decrease in overweight in children. It is necessary to continue promoting healthy habits from the earliest stages of life, thus reducing health inequalities.