How is Body Mass Index calculated?
It's a simple equation - of weight divided by height.
Jack McKenzie's 19.5kgs divided by his 104cm height gave a rating of 18.8. That put him in the 94th percentile - which classed him as overweight.
Jack McKenzie was branded as overweight when a school nurse calculated his BMI from his height and weight.
His mum Emily hopes to begin a campaign to find a different way of measuring children.
Emily says her son is growing, and the measurement reflects badly on parents, causing some to form unfair opinions of them.
More than two thousand teenagers from across the West took part in the annual Ten Tors event this weekend. In teams of six, the 14-19 year olds walked routes of 35, 45 or 55 miles, depending on their age.
This year 365 teams entered, with 325 completing the course. The drop out rate was just under 10 per cent. After a shower on the start line, the weather was relatively good for the teenagers.
First across the line was the Combined Cadet Force from Churcher's College in Hampshire at 09:10. It's the second year in a row they've been the first team to finish the 35 mile course. They were closely followed by the teams from Pilton Community College in Barnstaple and Kingswood School in Bath.
Morale was high at the finish line, as tired teenagers were reunited with worried parents:
Now in its 55th year, the event has become one of the biggest tri-service military exercises in Britain. Brigadier Jez Bennett, who organises the event, says the challenge is now more important than ever - teaching teenagers to respect the outdoors and each other:
The teams of students, scouts, ramblers and cadets come from Bristol, Cornwall, Devon, Dorset, Gloucestershire, Somerset and Wiltshire. They start training months in advance, for what is often one of the toughest challenges of their lives. This weekend they have been tested to their limits - and many will be back again next year to do it all again.
Kingswood School in Bath were the third team to cross the Ten Tors finish line:
The first three teams across the finishing line were: Churcher's College combined cadet force, Pilton Community College and Kingswood School.
Yesterday saw thousands of children across the West go back to school, and for many infants there was the added bonus of a free lunch.
The Government wants to ensure all 4 to 7 year olds get a hot dinner. But not all schools met yesterday's dealine. In Somerset alone, 15% of children will only have a cold lunch, because kitchens aren't ready. And a quarter of the new kitchens in Bristol schools have been delayed as suppliers struggle to meet demand. Ken Goodwin reports from a school in Gloucestershire.
More than 2,000 teenagers from across the West were out on Dartmoor this weekend for the annual Ten Tors challenge.
It's a gruelling test of survival and navigation, especially with the weather they had to deal with. We caught up with a team from Chew Valley School at the finish line.
Around 2,000 teenagers have completed the Ten Tors challenge on Dartmoor. Four hundred teams attempted to hike either 35, 45 or 55 miles across the national park in the annual event organised by the army.
Clare Forestier joined them.