I just wanted to let you know that when a product like a car mirror has advertising claiming it's 'crash tested', it's disingenuous at best. There are no government regulations regarding the crash testing of unregulated products like a mirror, so they can literally throw it against a wall, see if it breaks, and call it 'crash tested'. (Sort of the way that if you're shopping for groceries, the word 'organic' has a legal definition whereas the word 'natural' does not. Thus, you can see 'natural' branding on very UN-natural foods!)
The party line is that you should never use any unregulated aftermarket product. As a technician, that's what I tell parents. There is a real risk of it becoming a baby-injuring projectile, and not just theoretically. Documented cases, and all that.
If you are going to do it, hell or high-water, I recommend a VERY light-weight and flexible one (not the big plastic ones with the electronic features, etc.) with a mechanism that actually secures it to the vehicle (not just something that hooks on or rests in place). There are mirrors with straps that secure to the top tether anchor and so forth.
Best way to look at it...when you're putting something in the car with your baby, pick it up, hold it and think, "Would I throw this very hard at my baby's face?" and if the answer is NO WAY! It's probably something you avoid, or try to make as secure as humanly possible if it's unavoidable.
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Originally Posted by
DrBrockBaca 
I am a little concerned about that as well, but supposedly the ones I'm looking at are crash-tested and won't hurt the baby. In the event of an accident, I'm sure it's better to have as little in the car as possible, but I just don't know if I can drive around with the baby in the backseat and not be able to check on him/her from my rearview mirror. At least it will be mounted on the other side of the car and just angled towards the baby, so I think there is a lot less chance of it hitting the baby than if it were mounted on the same side.