A new research by a team from the UK and Norway has established that teenage pregnancy is “contagious” between sisters.
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.
‘Sister effect’
The researchers said the probability of the younger sister having a teenage pregnancy went from 20% to 40% if the elder sister had a baby as a teenager.
