NIRS Monitoring in the NICU and AKI

Inclusion Criteria: * Any neonate less than 30 weeks in gestational age * Willingness and capacity of both adult parents/guardians to sign consent Exclusion Criteria: * An infant with known congenital anomalies of the kidney (i.e., grade 4 or 5 vesicoureteral reflux (VUR), posterior urethral valves, moderate or severe hydronephrosis, autosomal recessive polycystic kidney disease (ARPKD), bilateral renal agenesis or dysplasia) * Age \>30 weeks gestational age * Age \<24 weeks and \<500 grams (will be excluded due to sensitivity of skin in this vulnerable population). * Clinician's decision that NIRS is not suitable due to the patient's clinical condition