If this problem is since the beginning, it is because of the separation anxiety
disorder wherein the child has not been exposed to sufficient social environment
independently. Here, parents and the child both need counselling and behaviour
therapy. If this problem starts at a later age, it suggests that some stressful
event has occurred with the child. Take your child into confidence and ask them
the reason behind this behaviour. If your child refuses to answer, don’t
pressurise him/her. Consult a clinical psychologist who will be able to help
your child better.