Each gamete contains half of the genetic material contained by all other cells in the human body.
Most U.S. infants do not sleep through the night until they are 1 year of age.
Boys are more often the victims of infanticide than are girls.
Apoptosis occurs during normal development. This term refers to:
The proportion of sleep that is REM decreases with age.
They can prolong labor, increasing the chance that instruments will be needed during the birth.
Newborns prefer to listen to their mother's voice.