A 3 year old child comes with complaint of limp diagnosis is
Septic Arhritis
Slipped capital femoral epiphysis
Pehe's disease
DDH
.Septic ahritis, also known as jointinfection or infectious ahritis, is the invasion of a joint by an infectious agent resulting in joint inflammation. Symptoms typically include redness, heat and pain in a single jointassociated with a decreased ability to move the joint.
Musculoskeletal  disorders