Final answer:
A child with bowed legs is typically deficient in vitamin D, leading to a condition called Rickets, which affects bone development.
Step-by-step explanation:
A child with bowed legs is likely deficient in vitamin D. This condition, known as Rickets, is characterized by improper bone development in children, which is primarily due to a vitamin D deficiency. Vitamin D plays a crucial role in the absorption of calcium and phosphate from the intestines, which are necessary for healthy bone development. A deficiency in vitamin D may lead to a decrease in absorbed calcium, causing bones to become soft and leading to skeletal deformities such as bowed legs.