Final answer:
The false statement about newborn sleep is that newborns must sleep 18 to 20 hours a day to stay healthy; sleep needs can vary with some newborns needing only 12 to 18 hours the answer is C.
Step-by-step explanation:
The statement that is FALSE regarding newborn sleep is: C. Newborns must sleep 18 to 20 hours a day to stay healthy. This is not accurate, as sleep needs can vary. Research suggests that newborns require between 12 and 18 hours of sleep, not necessarily 18 to 20. Therefore, while many newborns sleep a lot, they do not all need to sleep 18 to 20 hours to stay healthy.