In developed countries,low birth weight stems mainly from

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Cigarette smoking during pregnancy is a well-known risk factor for low birth weight. Smoking during pregnancy reduces the amount of oxygen and nutrients that reach the baby in the womb, thus leading to lower birth weight. Other factors such as the mother's poor health and nutrition can also contribute to low birth weight, but cigarette smoking is the main contributing factor in developed countries. Neither young age of mothers nor lack of exercise by mothers have been identified as major risk factors for low birth weight in developed countries.

In Developed Countries,low Birth Weight Stems Mainly from