Take care of their feelings
Sometimes it's hard for children to find the right words, or tell you when they are sad or frightened. So guardian should carefully observe the feeling of their child.
Babies and small children can be frightened by anything new and different, when there is no real danger. A stranger, a clown, or a loud noise, can all be very scary for a toddler who is not used to them. Sometimes you might feel tempted to laugh, to tease them or tell them 'not to be silly'. What they really need is for you to comfort them and give them a simple explanation.
This will help them feel good about themselves, and feel OK about talking to you if they have a serious problem.