Final answer:
The appropriate size laryngoscope blades for a newborn are the Miller 0 or Macintosh 1 blades.
Step-by-step explanation:
For a newborn, the appropriate size laryngoscope blades are the Miller 0 or Macintosh 1 blades.
The Miller 0 blade is the preferred choice for premature and term infants weighing less than 2.5 kg. It has a straight, elongated shape that allows for better visualization and maneuverability in the narrow airway of a newborn.
The Macintosh 1 blade is used for term infants weighing more than 2.5 kg. It has a curved shape that fits the contour of the infant's airway, making it easier to lift the epiglottis and visualize the vocal cords.
It is important to select the appropriate blade size based on the weight and size of the newborn to ensure safe and effective intubation.