Having 10 children may reduce the woman's cancer risk

Researchers examined cancer risk in nearly 5,000 Finish women who gave birth at least 10 times before 2010.

Over a three-decade period, there were 656 cases of cancer in these women, about 200 fewer cases than would be expected based on cancer rates in the general Finnish population, the study found.

In fact, the rate of new cancer cases was 24 percent lower among women who delivered 10 or more babies compared to those in the general population, the researchers said.

In the study, women who had 10 or more babies were about five years younger when they gave birth to their first child, compared to average Finnish women. It's known that becoming pregnant at a young age helps protect against breast cancer, said Dr. Juha Tapanainen, of the Department of Obstetrics and Gynecology at Helsinki University Central Hospital, Fox News reports.

Women who give birth before age 20 have about half the risk of breast cancer as those who give birth for the first time after age 30, according to the National Institutes of Health. Some researchers hypothesize that this is because pregnancy speeds up the process of breast cell maturation, and that mature cells are more resistant to cancer, Tapanainen said. 

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