No.
School nurses are capable health professionals, but that doesn’t mean they should routinely weigh kids.
Child obesity is notoriously difficult to prevent, even in ideal research settings. An unsolicited call or letter from an unfamiliar nurse explaining that your child is overweight, and offering referral, seems less than ideal. Some parents find such information useful; others find it belittling. Some students feel stigmatised when weighed at school.
Several studies find such screening to be ineffective in changing weight. So, while well-intentioned, I think the proposed model won’t work. This isn’t surprising, as studies show even significantly more intensive interventions over several years fail to help children’s weight.
We need more research to learn how nurses can best help. Programs incorporating combined dietary education and physical activity in schools, rather than advice and external referral, may be slightly more effective.
We should also act on drivers of obesity outside the health system. Let’s make healthier foods cheaper, and our physical environment more conducive to physical activity.