Campaigners have called for children to be measured throughout their school life to combat obesity.
Tam Fry, honorary chairman of the Child Growth Foundation, said the National Child Measurement Programme should be extended to include younger children.
He suggests that the majority of excess weight was put on in children's final three years at primary school.
"The government was advised as long ago as 2004 to implement this but refused to do it," said Mr Fry.
"We have to know when the early signs of unhealthy weight set in so that prevention measures can be put in place before weight becomes a problem."
The recent Health Survey for England showed primary school leavers had put on 20% more weight in a generation since 1990.
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Child Growth Foundation
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