**Core Concept**
In pediatric orthopedics, the management of femoral shaft fractures in children below 2 years requires careful consideration of growth plates, bone density, and the risk of complications. The goal is to achieve stable alignment and promote healing while minimizing the risk of growth plate damage and deformity.

**Why the Correct Answer is Right**
The traction used for femoral shaft fractures in children below 2 years is skin traction, which is applied to the affected limb using a Thomas splint or a Russell traction device. This type of traction is preferred in this age group because it is gentle on the growth plates and allows for early mobilization, reducing the risk of complications such as hip dislocation and contracture. The traction is usually applied to the affected limb, and the child is kept in bed with the affected limb immobilized in a position of comfort.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because skin traction is not suitable for older children or adolescents, where other types of traction or surgical fixation may be required.
**Option B:** This option is incorrect because hip spica cast is not typically used for femoral shaft fractures in young children, as it can be cumbersome and restrict movement.
**Option C:** This option is incorrect because skeletal traction is not the preferred method for children below 2 years, as it may cause damage to the growth plates.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that children below 2 years have open growth plates, making them more susceptible to growth plate damage and deformity. Therefore, the management of femoral shaft fractures in this age group requires a gentle and non-invasive approach to minimize the risk of complications.

**Correct Answer:** . Skin traction.