Which of the following describes an overstimulated infant?

An overstimulated infant may exhibit signs of color changes and irregular respiration due to the sensory overload that overstimulation introduces. These symptoms can manifest as the baby struggles to manage the stimuli in their environment, leading to physiological responses that include changes in skin color and breathing patterns.

In contrast, constant hunger and fussiness can result from various factors, including hunger itself or other discomforts, but these are not exclusive indicators of overstimulation. Excessive sleeping may indicate that an infant is overwhelmed and is retreating into sleep as a coping mechanism; however, it does not directly reflect the characteristics of overstimulation, which often involves heightened arousal. A serene demeanor with regular feeding suggests a calm and content infant, which is the opposite of what is typically observed in cases of overstimulation. Hence, the signs of color changes and irregular respiration in response to overstimulation correctly highlight the infant's distress and physiological reaction to being overwhelmed.