Prospective Study of the Feasibility of Brain Connectivity Imaging by Functional Ultrasound Imaging (fUS) in Newborn Infant

Inclusion Criteria: 1\. For group G1 (Premature babies): Gestational children: 1a. Between 23 WA+5 days and 27 WA +6 days (extremely preterm) (G1) or 1b. Between 28 WA+0 days and 31 WA+6 days (very preterm) (G1) 2\. For the G2 group (AIE): * Children of gestational age\> 36 WA + 0 days * with neonatal anoxo-ischemic encephalopathy * treated with controlled therapeutic hypothermia (group G2) 3\. For the G3 Group (IUGR): Gestational age between 32 WA+0 days and 40 WA+6 days and with IUGR intrauterine growth restriction: birth weight \< 10 p and/or head circumference \< 10 percentile (G3 group); 4\. For the G4 group : * Siblings with at least one child with signs of autism spectrum disorder * less than 6 months of age at baseline (G4 group) 5\. For the G5 group (control): * Children of gestational age between 39 WA and 40 WA + 6 days * without pathology during pregnancy (no vasculoplacental pathology, no threat of premature delivery, no maternal corticosteroid therapy, no consumption of toxic substances) * at birth: Apgar greater than 6 at M10; pH\>7.20; lactate\< 6 mmol/l; eutrophic; Birth weight \>10p; Cranial Perimeter \>10p 6\. Consent of the holders of parental authority 7. Child affiliated to or in receipt of a social security scheme Exclusion Criteria: * Person subject to a judicial safeguard measure (guardianship, curatorship or safeguard of justice) * Known malformative pathology; * Known chromosomal abnormality; * Known allergy to silicone