School uniforms with 50 inch waistlines are now on sale as children in the UK continue to balloon in size. Blazers are getting bigger too, with some stores selling sizes up to 54 inches for girls as well as boys - the equivalent of a woman’s size 30. Many school children now need new plus-size clothing, with one in 10 Reception pupils and one in five Year 6 students now obese, according to the National Obesity Observatory. Online retailer Sturdy Kids offers a pair of school trousers in waist sizes ranging from 42 to 50 inches in its 'Generous Fit Junior Trousers' section'. Online retailer Sturdy Kids offers a pair of school trousers in waist sizes ranging from 42 to 50 inches in its 'Generous Fit Junior Trousers' section' Independent shops also sell uniforms for larger children, while others specialise in oversize garments. They include Sturdy Kids, an online retailer with the tag line: 'For more than your average child'. In its 'Generous Fit Junior Trousers' section, it offers a pair of school trousers in waist sizes ranging from 42 to 50 inches. The website is also selling 54 inch blazers for boys and girls.It is likely than any child who needs to wear such a large item of clothing would be morbidly obese. A spokesperson for Sturdy Kids said they were 'rushed of their feet' and unable to comment. Another store, School Uniform Direct, which has branches in London and Surrey, has boys’ trousers with up to 44 inch waists.They also sell blazers in size 54 inch for boys and girls. BHS’s 'Generous Fit' size guide lists 40 inch (101cm) waists for 16-year-olds and 34 inch (84cm) for those aged 11. Professor David Haslam, chairman of the National Obesity Forum, said: 'Obesity in kids is growing. It is a very, very high rate, especially in the less affluent parts of the country. The website is also selling 54 inch blazers for girls. One in 10 Reception pupils and one in five Year 6 students now obese, according to the National Obesity Observatory. The website is also selling 54 inch blazers for girls. One in 10 Reception pupils and one in five Year 6 students now obese, according to the National Obesity Observatory. 'Clothing manufacturers are just reacting to the obesity epidemic rather than being part of its cause, but it’s a sad state of affairs that they are needed. 'The Government, the food industry and schools have a really big job to tackle the problem and the health authorities in managing it.' He added: 'In the 1970s, it would have been impossible to find these clothes, obesity has been in the making for 30 years. 'The average weight of the population has grown from malnutrition, to normal weight to overweight to obese - it is a tidal wave of obesity.' When asked about the health risks for children who need these plus-size clothes, Professor Haslam said: 'It is 20 to 30 years off their life with that kind of level of obesity. 'It’s premature heart problems, serious health problems, as well as the disabilities it can cause.' In the last few years, clothing chains have been forced to rip up their sizing system for children to reflect the fact youngsters are now taller, wider and heavier than ever. A recent study has shown the extent of children's growth over the past 35 years. The data will be used to create a new generation of clothing to fit the nation's taller and wider youth. A recent study has shown the extent of children's growth over the past 35 years. The data will be used to create a new generation of clothing to fit the nation's taller and wider youth. A new template for those aged four to 16 has been devised for retailers to reflect the major changes to body shapes over the last few decades. Six of the country’s biggest children’s fashion chains – Marks & Spencer, Next, George at Asda, Tesco, Monsoon and the Shop Direct group – are now using the guidleines. Full body 3D scans were carried out on 2,885 youngsters across the country to produce the updated size regime. The last time a comprehensive survey of children’s shapes was carried out was by the British Standards Institution in 1978. The figures were compiled by Shape GB, a collaboration between retailers, several academic bodies, clothing size experts Alvanon and scanner experts. Girls of 11 were found to be on average four inches wider around the waist, while boys are generally bigger through the waist and chest. Research has shown that over 80 per cent of obese children today will go on to be obese adults.