Between birth and 2 years,
A) fussiness increases.
B) crying increases.
C) the organization of sleep and wakefulness changes substantially.
D) total sleep time increases slowly.

Question

Quizplus · Accepted Answer

The organization of sleep and wakefulness changes substantially during the first two years of life. Infants initially sleep for short periods throughout the day and night without any regular pattern. However, by the end of the first year, most babies have developed consistent sleep and wakefulness cycles, typically sleeping through the night and taking one or two naps during the day. This change in sleep organization is a key developmental milestone during the first two years of life. Fussiness and crying also tend to decrease during this time, and total sleep time gradually decreases rather than increases. Therefore, options A, B, and D are incorrect.

Between Birth and 2 Years