Birth facts.

Pediatrics for Parents | March 1, 1990 | Copyright

For every 1,000 female births there are 1,051 male births.

These proportions are consistent from year to year.

In the U.S. one set of identical twins are born for every 250 births.

Of the 79,027 multiple births in 1985, 97.6% were twins.

The chance of having quintuplets is less than one in 5,000.

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