This issue of Advances in Pulmonary Hypertension highlights the important changes in the recognition of the causes of PH in children and its treatment. PH in children differs from adults as children frequently have multifactorial disease, with a combination of a congenital heart defect, chronic lung disease, and an abnormality of lung development. The “fetal origin” of PH in children has been emphasized by Dr Steve Abman in his article on diagnosis and treatment of the child with broncho-pulmonary dysplasia. Currently there are no FDA-approved therapies for children with PH/PAH; however, therapy for these children has improved quality