A first pregnancy may be the first and only time a pregnant teenager interacts with health services and this opportunity should not be overlooked.

生育第一胎时可能是这些未成年母亲第一次也是唯一一次与医疗机构接触，因此这个干预机会不应被忽视。

youdao

The researchers said the probability of the younger sister having a teenage pregnancy went from one in five to two in five if the elder sister had a baby as a teenager.

BBC: Teenage pregnancy is 'contagious'