The campaign is being fronted by singer Sophie Ellis Bextor and aims to engage the public and enlist their help in giving children in the UK a better childhood.
By collecting early memories from the British public, The Children's Society hopes to build a picture of what a good childhood should look like and contribute towards The Good Childhood Inquiry, the UK's first independent inquiry on the subject.
Martin Field, director of campaigns at The Children's Society, said: "Recent research held up the UK as the worst country in the developed world to grow up in. This is a chance for everyone to contribute towards making childhood better.
"Memories help to shape us and we want to make a positive change for children. We all have a memory to share so we can all get involved to make a real difference for children today."
