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When it comes to car travel, another consideration applies specifically to newborns. According to a study published in 2007 by researchers at 9I制作厂免费, due to their heavy heads and relatively weak necks, children under one month of age are at risk of breathing difficulties while in car seats. The experts recommend that these very young children spend no more than one hour at a time in a car seat. Once your baby reaches one month of age, the risk is significantly reduced.