kooilieng 发表于 19-3-2013 01:48 AM 
请问为什么rear facing的时候，belt要在肩膀下面呢？谢谢。
The safety harness must be in the slots that are at or below the child's shoulders:
In a rear-facing seat, the harness will hold the child down and in the seat in a crash. The harness must be at or below the shoulders to do this properly. If the harness is above the shoulders, the child can "ramp up" or rotate toward the top of the seat, exposing the head and neck to possible injury. For newborns and very young babies, the bottom harness slot may still be above the shoulders. As long as the harness is in the bottom slots, and the harness is snug, this will protect the baby.
这个有附上图片和解说：
Car Seat Safety: Correct Harness PositioningThis article is meant to help you understand why using the correct harness position is a key part of safe car seat use in daily life.
The Correct Harness Position for Rear-Facing Car Seats Please note: The best thing you can do to make sure you are using your Orbit Baby car seat safely is to follow all product instructions, and regularly refer back to your car seat's manual. In this article, we cover harness positioning for rear-facing car seats, including both our Infant Car Seat, and our Toddler Car Seat when used rear-facing. Shoulder Harnesses: OverviewFor all rear-facing car seats – not just Orbit Baby's – the correct positioning of the shoulder harness is at or below your child’s shoulders (see illustration at right). While this might seem like a simple rule, correctly setting the harness shoulder height is critical to your child being fully secured in the event of a sudden stop or impact. 
"DO NOT use shoulder strap slots that are above your child's shoulders. With the rear-facing Infant Car Seat, shoulder straps positioned in slots above the shoulders will not hold your child securely in a sudden stop or crash." - Orbit Baby Infant Car Seat Manual, page 53.
Orbit Baby's product instructions The illustration below shows incorrect usage of a rear-facing car seat harness. A version of this illustration appears in our manuals, along with the accompanying text:
Shoulder Harness: Concepts explainedRear-Facing: Explaining the "At or Below" shoulder harness positioning 
Incorrect Installation
A harness slot above the child's shoulders can allow the child to move upwards. As you can see in this illustration, a harness belt that is too high potentially allows for the child’s torso to travel twice the distance compared to the proper positioning below the shoulders.
Correct Installation
The harness straps are anchored snuglybelow a rear-facing child’s shoulders, and better restrain the child from sliding upwards.
The widely known standard that a rear-facing child should have harness straps at or below their shoulders has to do with the way a child's body would move in a collision. Simply put, many new parents don’t realize that putting shoulder harnesses too high for rear-facing car seats has a similar effect as not fully tightening the safety harness itself. Most car collisions happen when the car is moving forward (including the 72% that are purely frontal or frontal-offset collisions (Ref1 )), causing a rear-facing child’s back to be pressed against the seatback of the car seat. This means that a main goal of a rear-facing car seat harness is to keep the child's body from sliding upwards against the car seat's seatback. Any additional acceleration of the child upward influences the performance of any rear-facing car seat. Also, every tiny increment of increased distance the child moves exponentially amplifies the forces on the child's body. The more a child’s body accelerates, the more the child’s head and chest are subjected to increased g-forces both at the beginning of the collision and during the deceleration after the collision. Shoulder slot positions relative to child size Given all of the information above, some parents have asked us why we do not recommend certain harness positions for specific child weights or heights. The reason is that the shoulder harness position depends only on your child’s seated "torso height," and there have been no studies we know of that correlate a child's torso length to the child’s height or weight. As you can imagine, a big child could have a relatively short torso (in which case they might not use the top shoulder slots), or an average child could have a tall torso (in which case they might well need to use the top slot). I
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发表于 11-5-2010 03:14 PM
你也是在mybbstore.com购买的吗？
本帖最后由 藤原佐为 于 12-11-2012 10:57 PM 编辑 
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