Preterm birth is associated with attention deficit hyperactivity disorder a new research has revealed. Another research study published in the Springer Nature-branded journal Pediatric Research has found that the brain in infants with preterm births develops differently in girls and boys and that boys are more severely affected. The research states that in preterm births the cerebral volume is smaller. Although the effects of prematurity were seen in both boys and girls these effects were more severe for boys states Science Daily. Preterm birth is when the baby is born before completing 36 weeks in the womb. There are many