Perinatal Covid-19 Infection, NO Pathway, and Minipuberty

Inclusion Criteria: * Group 1 : Newborn infants (24 to 41 weeks gestational age) or young infants (\< 3 months) admitted at the maternity ward or at the Department of Neonatology at Jeanne de Flandre Hospital, CHU of Lille with perinatal COVID-19 infection defined by: * Antenatal COVID-19 infection: pregnant women with positive PCR test at any time of the pregnancy; * Post-natal COVID-19 infection: newborn or young infants (\< 3 months) with positive PCR test in pharynx or stools as part of their treatment. * Group 2 : Newborn infants (24 to 41 weeks gestational age) or young infants (\< 3 months) admitted at the maternity ward or at the Department of Neonatology at Jeanne de Flandre Hospital, CHU of Lille for severe cardiorespiratory diseases requiring inhaled NO treatment. * Group 3 : The control group without perinatal COVID-19 infection and no inhaled NO treatment will be matched to the two other groups on age at birth (± 2 weeks of gestation), on postnatal age (± 3 weeks), on respiratory failure (yes/no). * No inclusion in another ante- or post-natal trial; * Written consents from both parents. * Social security affiliation Exclusion Criteria: * Preterm birth less than 24 weeks gestational age. * Severe brain lesions: bilateral and extensive periventricular leukomalacia, intracranial hemorrhage grade 3 or 4; * One or both of the parents is unable to read or understand French language, or refuse to participate