In the baby/small child Rule of Nines, what percentage is allocated to the head?

In the baby/small child Rule of Nines, what percentage is allocated to the head?

• A. 9%
• B. 21%
• C. 18%
• D. 13%

Answer: (B)

In babies, the head is proportionally larger than in adults, so it makes up about 18% of the total body surface area. This fits the pediatric distribution where each arm is 9%, each leg is 14%, and the trunk is split into 18% anterior plus 18% posterior, adding up to 100%. So the head share for an infant is 18%, not the adult 9% or any other value. Among the common options, 18% is the correct percentage for the head in a baby.

In babies, the head is proportionally larger than in adults, so it makes up about 18% of the total body surface area. This fits the pediatric distribution where each arm is 9%, each leg is 14%, and the trunk is split into 18% anterior plus 18% posterior, adding up to 100%. So the head share for an infant is 18%, not the adult 9% or any other value. Among the common options, 18% is the correct percentage for the head in a baby.