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I know that using a latch and seat belt together is wrong.
But, my fiance wants proof, and I don't know where to find it. Normally, he agrees with me on car seat things....ERF, five point latch for several years, etc. But, yesterday, he was putting his mom's Maestro in her mom's car, and it was loose with just the latch....like he was sitting on it, pulling on the strap until his hand hurt, and it was still loose. So, he seat belted it too. I told him that our daughter could not ride like that, and she did not, but he could not understand the reasoning, saying that it sounds more safe. I know every manual I have seen says no, but he's the type that likes solid proof. Is there anyone that has any links that will prove what I am trying to get across to him?
I don't agree that he is being absolutely ridiculous, hence the reason I came here to ask for advice and to see if there were *reasons* out there.
Normally, we agree on the safety of our child, like with ERF (for example), he understands there is a huge safety benefit. When a person thinks about it (Me included), it would seem that double protection (both the latch and the seat belt) would make the car seat even safer, even though the manual says that it is not.
I was just checking to see if there were any links that you knew of that had reasons behind not using both, kind of like there are links that talk about ERF and the benefits. I didn't think it was a ridiculous request, as you pointed out. Thanks, though.
As for the OP's question, I don't have any links off the top of my head, but there are a couple reasons the manufacturer will state not to use both. One is that it hasn't been tested. In this case, he'd be making your dd a guinea pig. We don't know what will happen in an accident. The other reason is that they tested it and it failed in some way. In this case, it again is not safe. I will try to email/pm you this as well in case you have (understandably) bowed out of the thread).
I believe that (Erica, correct me if I'm wrong) the reason is because the latch and seat belt together could put too much pressure on the seat in a crash and cause it to fail. Also, they are not tested with both the latch and the seat belt, so to use it improperly (using both) voids the warranty.
Both Augie and Rachel have answered this pretty correctly. Also, in many states it is illegal to use a car seat incorrectly, meaning that if the manufacturer says "you can't use latch and seatbelt together", and you do, then you are committing a crime.
I never suggest using a car seat in a way it has not been tested and PROVEN safe, and LATCH and vehicle seat belt has not been tested and proven safe when used together.
I hope that your fiance can come around and understand that there are reasons that they are not used together, even if those reasons are not obvious to us.