A healthy way for children to express their feelings is by talking about them and why they feel that way.
Not only does it make the child feel better when saying it out, it also allows the child to practice self-control and not act out the feelings on impulse. Sharing their feelings with others helps the child seek appropriate support from adults.
Moreover, it can be used to help others empathise with the child, especially those who may have contributed to how the child feels; and this practice may prevent future occurrences of the child feeling that way.
Children are at the stage where they are exploring the world, and will encounter an array of new experiences.
They start off not knowing how to deal with the emotions attached to these new experiences.
Hence, it is crucial for them to be equipped with the ability to tell others how they feel, instead of keeping their feelings to themselves.
For example, if a child is extremely anxious after seeing a big spider, but does not know how to tell others how he feels or is not able to self-regulate his emotions, he may end up withholding his feelings inside, and these unattended feelings may escalate into behaviours like sudden outbursts.
This could be avoided if the child was able to tell others how he felt at that immediate moment, and a teacher or parent could comfort him immediately and tell him that it is okay to feel that way.