Kaestner said the family is trying to make life seem as normal as possible for their children.

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For second children, the ratio was normal for mothers born in Canada.

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To qualify for the study, the children had to have a normal IQ and not need a medication change during the five-day study period.

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"Poor behaviour which would be dealt with within the family should not be an express route into the criminal justice system for children who do not have the benefit of a normal family life, " committee chairman, Lib Dem MP Sir Alan Beith, said.

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And it became widely accepted that children require nurturing human beings not just for food and protection but also for the normal functioning of their brains.

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Experts agreed that parents should exercise normal caution for trick-or-treating, such as checking candy and treats before their children eat them and making sure children wear reflective clothing at night.

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The phenomenon of precocious puberty - when children develop the first signs of puberty earlier than the normal ages of ten for girls and eleven-and-a-half for boys - is increasing all over the western world.

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