finances, living in poverty means less access to good medical care.
education of parents, those with low ed achievement have more difficulty accessing health care
ditto literacy and language.
poverty effects the quality of food, housing, heating resources etc all of which affect health.
the physical and mental health of the parents. those who are fit and well will be able to support their children in a more positive way, those who are ill, drink, use drugs etc will be less likely to. a sick sibling can mean a child parents have less time to spend in them so their mental health may suffer.
genetic illnesses and conditions.
etc etc
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