Which of the following is true about REM sleep in infancy?Multiple choice question.It takes up about 10 percent of the infant's sleep cycle.It often begins an infant's sleep cycle.It is common for infants to not have any REM sleep.It increases as the infant grows.

The correct answer is: It often begins an infant's sleep cycle.

Rapid Eye Movement (REM) sleep, also known as active sleep, is a unique phase of sleep in mammals and birds, characterized by random rapid movement of the eyes, accompanied by low muscle tone throughout the body, and the propensity of the sleeper to dream vividly.

In infants, REM sleep can take up to 50% of the sleep time and it often begins their sleep cycle, unlike adults where REM is the last phase of the sleep cycle. As the infant grows, the amount of REM sleep gradually decreases. Therefore, the statement "It increases as the infant grows" is incorrect.

The statement "It is common for infants to not have any REM sleep" is also incorrect. REM sleep is essential for infants, especially for their brain development.

The statement "It takes up about 10 percent of the infant's sleep cycle" is also incorrect. As mentioned before, REM sleep can take up to 50% of an infant's sleep time.