This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New born infants, Subject name: Pediatrics
All of the following can occur in a normal neonate for heat regulation except _______ 
Select and explain. 
A. Shivering, B. Breakdown of brown fat with noradrenaline secretion, C. Universal flexion like a fetus, D. Cutaneous vasoconstriction
A: Shivering
Answer: A: Shivering 
Explanation: Neonates donot generate heat by shivering. Heat production in neonates happens by increasing the metabolic rate and oxygen consumption by releasing norepinephrine, which results in non-shivering thermogenesis through beta-oxidation of brown fat. Preterm and small-for-gestational-age (SGA) infants have scanty brown fat stores. Ref: Nelson textbook of pediatrics 21st edition pgno: 872