Fellowship training. After medical school, a general psychiatry residency lasts 4 years. Becoming a child psychiatrist requires 2 more years of additional specialized training in psychiatric work with children, adolescents, and their families -- in an accredited residency in child and adolescent psychiatry. In some programs, one can begin this after completing the 3rd year of psychiatry training. Good luck to you!
Longer. Takes extra years, not harder, very rewarding.