The type of arousal that Cody is expereincing as noticed by his mother is Alert inactivity.
This is an arousal state that is usually found in babies of Cody's age that is marked by the baby engaging in visual exploration.
This arousal states describes babies entering into a state of inactivity where they don't do much apart from being quiet and exploring the surrounding with their eyes.
Find out more on states of arousal at https://brainly.com/question/4181598.