Final answer:
A nurse looks for extra skinfolds inferior to the gluteal region when assessing a newborn for developmental dysplasia of the hip (DDH).
Step-by-step explanation:
The nurse assessing a newborn for developmental dysplasia of the hip (DDH) looks for extra skinfolds on different parts of the newborn's body. In particular, the nurse would examine the area inferior to the gluteal region for any additional skin folds that might indicate DDH, which is option (a) among the choices provided. Other areas such as the calf muscles, the popliteal area, back of the thigh, and lower portion of the abdomen are not typically where one would look for signs of DDH. It's crucial to identify DDH early as it can greatly impact the infant's development and mobility.