A neonate weighing 1.3 kg is born at 32 weeks' gestation and was transferred to the nursery for prematurity. After 1 hr the nurse repos the infant is tachypnoeic with hea rate 150 bpm, respiratory rate 76/min, temperature 95degF and oxygen saturation of 98%. The lungs are clear with bilateral breath sounds and there is no murmur and x-ray chest is normal. Which of the following is the next step in management of the neonate?