No.
The Australian College of Nursing plan is doomed. Risk factors for overweight and obesity are highly complex, encompassing genetic and environmental factors.
Height-weight measurements are used to calculate body mass index (BMI) – an unreliable evaluation of healthy versus unhealthy weight for adults, let alone children. Critical growth periods during childhood and adolescence can skew these assessments. The effects of puberty can be overlooked, along with ethnicity, fat distribution, and variations in bone density and muscle mass.
The proposal also conflates height and weight, with health and physical activity levels. Weight is a poor predictor of health, and there is no research consensus about how a child’s weight affects their levels of physical activity.
This all feels like a surveillance scheme fuelled by moral panic about childhood obesity. Worryingly, it could lead to body shaming children and young people at a time when they are already extremely vulnerable to mental health conditions.