A developing child would experience all sorts of emotions. S/he is forming their own perceptions about self, others, and the world at large. The phenomenological experience a child goes through contributes to this perception, their overall well-being, and the coping mechanism they would learn to adopt. Mental health issues in children are as real as in adults. Thus, mental health care, for a developing child is as imperative as it is for anyone else.
An emotionally disturbed child would most likely show struggle in connecting to self and others. Their physical and social activity may be affected. They would sleep / eat more/less than usual. They may be resorting to escapism or passive or aggressive behavior. There could be harm to self or others involved. They might be unable to give back to the community.
With negative experiences, children show fear and struggle to get in touch with their emotions, in understanding themselves, begin a conversation, and name their emotions with limited emotion vocabulary. They may be alarmed by the possible undesirable consequences if they said something. Nonetheless, they would still be expressed through words or actions. Are were listening closely though?
Communication plays a momentous role in nurturing positive mental health.