Inclusion Criteria:  All parenting authority holders of children aged 1 to 5 years, born after 34 weeks of amenorrhea and having been cared for neonatal PAH in paediatric resuscitation  Exclusion Criteria:  Holders of parental authority who cannot answer the questionnaire because they do not speak French. Opposition of one of the two holders of parental authority Minor parental authority holders Holders of parental authority under safeguarding of justice, guardianship or guardianship Newborns with neonatal PAH with an associated diagnosis of diaphragmatic hernia or cyanogenic congenital heart disease Newborns with neonatal PAH not treated with nitrogen monoxide