Teenage pregnancy 'contagious'

Teenage pregnancy is "contagious" between sisters, researchers in the UK and Norway have claimed.
A study of more than 42,000 Norwegian teenage girls suggested they were more likely to become pregnant if their older sister had a baby as a teenager.
The effect was greatest when the sisters were of a similar age or from a poorer background.
The Family Planning Association said the results may not necessarily apply to the UK but were still interesting.
Factors such as family background and level of education are already known to influence teenage pregnancy. This new research, carried out in conjunction with the University of Bristol, looked at the specific effect sisters have on each other.