Final answer:
The initial nursing intervention should be to give the child ½ cup (120 ml) of a sugar-sweetened carbonated beverage.
Step-by-step explanation:
The initial nursing intervention should be to give the child ½ cup (120 ml) of a sugar-sweetened carbonated beverage. A blood glucose level of 60 mg/dL (3.4 mmol/L) indicates hypoglycemia, which is low blood sugar. Providing a quick source of sugar, like a sugar-sweetened carbonated beverage, will help raise the child's blood glucose level back to a normal range.