Why does extreme low birth weight infants tend to have more behavioral and mental health issues than their peers?

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why does extreme low birth weight infants tend to have more behavioral and mental health issues than their peers?

What is the adverse effect of extremely low birth weight on babies?
Some babies with low birthweight are healthy, even though they’re small. But having a low weight at birth can cause serious health problems for some babies. A baby who is very small at birth may have trouble eating, gaining weight and fighting off infections. Some may have long-term health problems, too.