It is crucial that the upper back and neck are held in an erect position to give support for the head.
重要的是：上背和颈部要挺直以支撑头部，这一点很重要。
Enhanced side walls and head support provide comfort and safety for the child.
增强的侧墙和头部支撑，为儿童提供舒适和安全。
Enhanced side walls and head support provide comfort and safety for the child.
增强的侧墙和头部支撑，为儿童提供舒适和安全。
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