Marriage matters for kids. 90 percent of kids born to cohabiting parents end up living without both parents.

Marriage is huge for kids while cohabitation results in most kids born in those relationships will end being raised by one parent, 90 percent in fact.

Here's one news story on this new study.

Half of all British children born this year will be living with only one parent by the time they reach their teens, a study has revealed.

The study, titled “The myth of long-term stable relationships outside of marriage” undertaken by the Marriage Foundation, found that 45 percent of British teenagers between the ages of 13-15 are not living with both parents and that 9 out of 10 children born to unmarried, cohabiting “partners” will be living in single-parent households by their teens.

The study examined the differing rates of “family breakdown” experienced by married and cohabiting couples using data from the Understanding Society national longitudinal survey of 40,000 British households.

The numbers indicate that half of all cohabiting couples will break up within a year of moving in together. Nearly one-fifth (17 percent) of babies under a year old do not live with both natural parents, and that number jumps to 47 percent by the time the child is 15.

Significantly, the numbers are radically different for the children born within marriage: 93 percent of parents who stayed together were married before they had a child.

“The relative scarcity of ‘long-term stable relationships’ outside of marriage confirms that it is disingenuous and untenable for government to keep airbrushing marriage from family policy papers,” the study’s author, Harry Benson, said. “This should be an important issue for government since the direct costs of family breakdown are estimated at £46 billion,” more than the entire budget for national defense.