Babies who experienced oxygen deprivation before birth may be at risk for attention problems.
Researchers at Kaiser Permanente reviewed the health records of nearly 82-thousand children.
They found those who'd had respiratory distress or oxygen deprivation in utero had an increased risk for developing attention-deficit hyperactivity disorder.
There was also a link found among those whose mothers had extremely high blood pressure while pregnant.
Association was strongest for preterm births and deliveries with cord complications.