Paediatricsniche
A term boy is 32 hours old and was recorded as normal at the newborn check. He now feeds slowly and tires, is mottled and cool to the knees, and his capillary refill time is four seconds. The femoral pulses are difficult to feel. There is no murmur and the chest is clear. Oxygen saturation is 96% on the right hand and 87% on the right foot, and both readings are unchanged after ten minutes in headbox oxygen. His blood glucose is 3.6 mmol/L and his temperature is 36.7 degrees. Which one of the following should be done first?