What Can I Do?

Listen calmly to your child. Take what they tell you seriously. It takes a great deal of courage for a bullied child to report bullying and to ask for help. Helping them insufficiently may result in them never asking again. On the other hand, taking action too quickly, without fully discussing the best approach to take with your child, can also make them reluctant to talk to you in future
Reassure your child that they are not at fault for being bullied, that they have nothing to be ashamed of, that those doing the bullying are in the wrong, not them.
Reassure your child that you are going to help them, that together you can make the bullying stop.
Make a note of what happened, what was said and done and by whom. Bullying is something that usually happens on an on-going basis so keep a record of any further incidents. This will be helpful to members of staff dealing with the bullying at your school or wherever else the bullying is happening.
Make an appointment to see the school, club or other organisation.
Whilst speaking to staff members, try and discover more about your child. Have they been bullied before? Is it happening often?
Bullying is a traumatic experience and many children who feel unable to assert themselves and stop the bullying can enter into a 'victim state' that increases their risks of being bullied again.

Kidscape have produced a leaflet called Stop Bullying​ with advice for children and young people, parents and staff.
They have also written an excellent leaflet for young people called ‘You Can Beat Bullying’, with plenty of practical advice on how to respond to bullying.