A nurse cares for a child with Legg-Calve-Perthes disease and is in Buck extension traction. Which of the following actions should the nurse take?

Choice A reason: Diphtheria causes a thick throat membrane, not Koplik spots. It is a bacterial infection affecting the respiratory tract, leading to airway obstruction, but lacks the characteristic oral lesions seen in measles, making it an incorrect association with this clinical sign.

Choice B reason: Fifth disease, caused by parvovirus B19, presents with a slapped-cheek rash, not Koplik spots. It affects the skin and occasionally joints but does not involve mucosal lesions, distinguishing it from measles, which uniquely features these oral spots.

Choice C reason: Measles (rubeola) causes Koplik spots, small white lesions on the buccal mucosa, appearing before the rash. These spots result from viral replication in mucosal cells, a hallmark diagnostic sign of measles, aiding early identification of this highly contagious viral infection.

Choice D reason: Poliomyelitis, a viral infection, affects the nervous system, causing paralysis, not Koplik spots. It lacks mucosal involvement, focusing on motor neuron damage, making it unrelated to the oral lesions characteristic of measles, an entirely different viral pathology.

Choice A reason: Allowing an infant with a hip cast to stand risks disrupting the correction of developmental dysplasia, as weight-bearing can misalign the hip joint. The cast maintains proper positioning, and standing could cause joint instability, delaying healing and proper femoral head development.

Choice B reason: Latex balloons pose a choking hazard and risk allergic reactions in infants. They do not promote developmental dysplasia recovery or growth, as they provide no therapeutic stimulation. Visual stimuli are beneficial, but safe, age-appropriate toys are needed to support development.

Choice C reason: A small electronic toy stimulates cognitive and sensory development in a 10-month-old with a hip cast. It encourages fine motor skills and engagement, supporting developmental milestones like object exploration and cause-effect learning, which are critical despite mobility restrictions from the cast.

Choice D reason: Prompt diaper changes prevent skin breakdown, important in a casted infant, but do not directly promote growth and development. While hygiene prevents infections, it addresses physical care, not cognitive or motor milestones critical for developmental progress in this age group.