Do teenagers give birth to a baby earlier than adult mothers?

Many do. Unfortunately the younger the mom the more likely they are to have some of the complications of pregnancy including premature labor, high blood pressure & other problems that result in early deliveries.Some do fine & deliver at term & for all, close OB care can help avoid an early delivery & worrisome problems for baby.
Yes. Giving birth at preterm, low birth weight, and pregnancy-induced hypertension (toxemia of pregnancy) are noticeably higher among teen mothers.