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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.