Heat Retention Head Wrap Use for Re-warming of Infants Requiring Cardio-Pulmonary Bypass

Inclusion Criteria: * Undergoing CPB surgery. * Weigh ≥ 3 and ≤ 10 kg. * Cooled to 24-30 degrees Celsius. * Head circumferences between 33-48 cm. * Scalp free of skin lesions such as reddened areas, ulcerations, abrasions, burns, and hemangiomas. Exclusion Criteria: * Require cooling below 24 degrees Celsius at any point during CPB surgery. * Weigh less than 3 kg or more than that 10kg. * Are premature or \< 37 weeks corrected gestational age. * Have a head circumference smaller than 33 cm or larger than 48 cm. * Have a known or previously diagnosed neurological trauma, malignant hyperthermia, stroke, seizure, VP shunt, evidence of scalp lesions, or other known comorbidity. * Have hair braided close to the scalp. * Infants with known allergy or sensitivity to polyethylene terephthalate (known as Mylar)