I'm not sure that I'm in favour of a specific right for children, such as the right granted recently by the Europeans. The law already allows us to remove certain data when the damage is greater. It's true that the situation of children is more sensitive. The data can already be removed in certain cases.
I would also say that solutions exist. Facebook, for example, is very responsive and is already very good at removing problem images and videos. The company is extremely effective because it controls, in spite of what it says, the social media. It can limit the damage by removing the data and images of children. It's not a problem situation.