What is the correct amount of fluid to administer to a five-week-old infant weighing 8 pounds with significant dehydration?

What is the correct amount of fluid to administer to a five-week-old infant weighing 8 pounds with significant dehydration?

• A. 82 mL
• B. 72 mL
• C. 36 mL
• D. 160 mL

Answer: (B)

The main idea is weight-based fluid dosing for pediatric dehydration. For a five‑week‑old infant weighing 8 lb (about 3.6 kg), the standard rapid bolus is 20 mL of isotonic crystalloid per kilogram. Multiplying gives 3.6 kg × 20 mL/kg ≈ 72 mL. So the best single bolus amount is about 72 mL, given IV or IO over a few minutes, with reassessment after the bolus. If signs of dehydration or shock persist, additional boluses may be given up to the recommended total, but the initial targeted amount is 72 mL in this case.

The main idea is weight-based fluid dosing for pediatric dehydration. For a five‑week‑old infant weighing 8 lb (about 3.6 kg), the standard rapid bolus is 20 mL of isotonic crystalloid per kilogram. Multiplying gives 3.6 kg × 20 mL/kg ≈ 72 mL. So the best single bolus amount is about 72 mL, given IV or IO over a few minutes, with reassessment after the bolus. If signs of dehydration or shock persist, additional boluses may be given up to the recommended total, but the initial targeted amount is 72 mL in this case.