Health chiefs at Lancashire Care NHS Foundation Trust are urging parents to use the summer to tackle the child obesity time bomb.
The trust is raising awareness of the dangers of being above a healthy weight during childhood.
Judith Mace, head of the health improvement service, said: “Being overweight during childhood can have a serious impact on both long-term and short-term health.
“Obese children can suffer from poor sleep patterns, raised blood pressure and asthma or other respiratory problems very early on in their lives.
“It’s really important to recognise that obesity is a serious problem which needs to be tackled.”
For information visit www.nhs.uk/change4life