Children have more than 1,000 pictures of themselves posted online before they turn 13, the Children's Commissioner has warned, as she backed the Telegraph’s Duty of Care campaign.

Anne Longfield, the Children’s Commissioner for England, said today children’s digital footprint was starting in the womb, from the moment parents posted their scans on social media.

She also warned that children’s lives were being “datafied” on a huge scale as their personal information was being collected by smart toys, smart speakers and even school apps.

The findings come as the commissioner’s office released a report raising concerns about the amount of personal data children and their parents were giving away before they turned 18.

It warned the sheer volume of information could have serious consequences for children when the grow up as more and more important decisions were being influenced by algorithms looking through personal data.