The NSPCC has written this useful article about talking to children about their worries. Often they pick up on much more than parents realise, making a conversation with them about it necessary.
Our children are precious to us. We all want them to grow up in a safe and loving environment and become happy, confident adults. To get there they need to be surrounded by positive influences, good advice and the knowledge that if they ever need help and support there will be someone to talk to.