A 5-month-old baby (exclusively cow feed) presented to pediatric OPD with history of crying on touch. Cause may be:
**Core Concept**
The baby's presentation of crying on touch, or "crying on palpation," suggests a possible diagnosis related to the musculoskeletal or nervous system. In a 5-month-old baby, this symptomatology points towards a condition affecting the normal development of the musculoskeletal system.
**Why the Correct Answer is Right**
The most likely cause of this presentation in a 5-month-old baby is **Congenital Dislocation of the Hip (CDH)**, also known as Developmental Dysplasia of the Hip (DDH). This condition occurs when the hip joint does not form properly, leading to the femoral head slipping out of the acetabulum. The femoral head may be dislocated anteriorly, posteriorly, or even be absent. This condition can cause pain and discomfort, especially with movement or palpation, which may lead to crying in infants.
**Why Each Wrong Option is Incorrect**
* **Option B:** While **Rickets** can cause musculoskeletal pain and discomfort, it typically presents with signs of bone deformity, growth retardation, and softening of the bones (osteomalacia). Rickets is not the primary cause of crying on touch in a 5-month-old baby.
* **Option C:** **Torticollis** is a condition characterized by an abnormal head or neck posture, often due to muscle imbalances. While it can cause discomfort and pain, it is not typically associated with crying on touch in infants.
* **Option D:** **Scoliosis** is a curvature of the spine, which can cause musculoskeletal pain and discomfort. However, it is not typically diagnosed in infants as young as 5 months, and the presentation would be more related to spinal deformity rather than pain on touch.
**Clinical Pearl / High-Yield Fact**
In infants, **crying on touch** can be a red flag for conditions like CDH. Always inspect the infant's hips for any signs of asymmetry or dislocation, especially in the first few months of life.
**Correct Answer:** C.