Short answer
When BVC says the chart is deviating, it usually means the child's BMI is increasing faster than expected — not that the child is ill. An "upward crossing" of percentile channels is an early warning sign that should be monitored, but not panicked over. It only becomes medically serious when iso-BMI exceeds 30, when height growth slows down at the same time, or when other symptoms are present.
What BVC looks at
BVC (child health centre) uses a growth chart where the child's height, weight, and BMI are plotted at each visit. The chart has "channels" (percentiles) showing where most children of the same age lie. What matters is not a single reading — it is the pattern over time.
When BVC says the chart is "deviating", they usually mean one of three things:
- Upward crossing — BMI moves from one percentile channel to a higher one. This is the most common early sign that weight is increasing faster than height.
- Iso-BMI above the threshold — 25 corresponds to overweight, 30 corresponds to obesity.
- The chart starts high from the outset — often combined with a family history.
"Deviating" is not the same as "pathological"
A deviating chart is a flag, not a diagnosis. It means that healthcare services want to monitor the child more closely — not that something is wrong right now. Many children have a period of faster weight gain before growth spurts, and it often rights itself.
What should, however, always be taken seriously:
- Iso-BMI ≥ 30 — this is obesity and a chronic disease that must be treated. See the difference between overweight and obesity.
- Weight increases while height growth slows down.
- Symptoms are present — snoring, breathlessness, joint pain, thirst.
- The family has obesity, type 2 diabetes, or cardiovascular disease.
Next steps
Ask to see the chart yourself and ask specifically: "Is this an obesity diagnosis, or are you monitoring a trend?" Both answers are fine — but they lead to different actions.
- Monitoring a trend: Follow-up visit in 3–6 months. The family can start with small everyday changes (sleep, screen time, physical activity, regular meal patterns) without focusing on weight.
- Obesity diagnosis: Referral to BUMM (paediatric outpatient clinic) for assessment and a treatment plan.
What you should not do
- Put the child on a diet or start talking about "losing weight". Weight-focused comments from parents increase the risk of eating disorders.
- Ignore the appointment for a follow-up visit. Early follow-up yields the best results.
- Try to interpret the chart alone — ask BVC to explain what they see.
If you are wondering how to discuss the BVC visit at home, there is practical advice in the guide on talking to children about overweight, focusing on reassurance and the habits of the whole family.
When you should seek care yourself
If BVC takes a wait-and-see approach but you see clear symptoms (snoring, joint pain, breathlessness), or if iso-BMI is above 30 and nothing is being done, you can contact the vårdcentral (health centre) yourself and ask for a referral to BUMM.
Related questions
- When is overweight in children something to take seriously?The patterns that signal overweight needs investigation — and where to seek help.
- What happens during a BUMM assessment for childhood obesity?Step by step through the first BUMM visit — what is measured, which tests are taken, and how to prepare your child.
- Why is my child gaining weight so fast?Common causes of rapid weight gain and when you as a parent should seek healthcare.
Sources
- Rikshandboken i barnhälsovård — Increasing BMI, overweight and obesity
- 1177 Vårdguiden — Weight in children
- National clinical guidelines for the treatment of obesity in children and adolescents (2023)
Last updated: April 2026