In England and Wales, you can babysit at any age, whether you are paid or not. In Northern Ireland, you must be at least thirteen. You are allowed to look after a child of any age. However, if the child you are babysitting is thought to be at risk because it is not being looked after properly, the child's parents could be prosecuted, or action could be taken to put their child into care.
If you are over the age of 16, you can be charged with a criminal offence if you deliberately assault, ill-treat or abandon a child in your care.