Frog-legged posture in infancy is described by which alignment?

• A. Hip flexion with external rotation and knee flexion
• B. Hip extension with internal rotation
• C. Knee hyperextension with hip adduction
• D. Ankle dorsiflexion with knee flexion

Answer: (A)

Infant frog-leg posture is a reflection of hips that are flexed, abducted, and externally rotated with the knees bent. This fetal-like alignment is normal in newborns as they settle after birth. The description of a hip in flexion with external rotation and the knee in flexion matches this position exactly: when the hip is bent and turned outward, the knee naturally stays bent. The other options describe different joint positions—hip extended with internal rotation, knee hyperextension with hip adduction, or ankle dorsiflexion with knee flexion—that don’t capture the characteristic bent, outward-rotated hip posture seen in frog legs.