Which intervention should the nurse teach to parents of how to help prevent respiratory infections in infants with Down syndrome?

A. Skin-to-skin contact promotes bonding and thermoregulation; it does not increase respiratory infection risk. B. A dry environment can dry mucous membranes, making the infant more susceptible to infection. C. A cool mist humidifier keeps the airway moist, reduces mucus thickening, and helps prevent respiratory infections, which infants with Down syndrome are at increased risk for due to hypotonia and airway abnormalities. D. High-sugar formula has no role in infection prevention and could contribute to other health issues.