The website of the Association of Child Psychotherapists is a good source of information for parents, carers and young people who are concerned about mental health and want to know more about child and adolescent psychotherapy.
They have also produced a leaflet for parents of Babies with serious illness
https://www.childpsychotherapy.org.uk/resources-families/understanding-childhood
https://www.childpsychotherapy.org.uk/resources-families/information-young-people
Are you thinking of suicide: please look at https://www.papyrus-uk.org/ . Are you, or is a young person you know, not coping with life? For confidential suicide prevention advice contact HOPELINE247 or call 0800 068 4141. You can email pat@papyrus-uk.org
Self harm is a powerful communication and needs to be understood and care taken https://www.youngminds.org.uk/young-person/my-feelings/self-harm/
If you are worried about child sexual abuse, grooming and/or exploitation please look at this page https://www.nspcc.org.uk/what-is-child-abuse/types-of-abuse/child-sexual-abuse/e
If neurodiversity such as Autism or ADHD/ADD is puzzling or causing emotional or relationship difficulties please look at this page as a starting point https://www.autism.org.uk/
To begin thinking about managing disordered eating look at https://www.beateatingdisorders.org.uk/
For information related to the new NHS gender incongruence service https://www.ardengemcsu.nhs.uk/services/clinical-support/national-referral-support-service-for-the-nhs-gender-incongruence-service-for-children-and-young-people/
https://www.nhs.uk/mental-health/conditions/post-natal-depression/treatment/