Is it true that crib bumpers are a suffocation hazard? What’s safer a crib bumper the classic once or the crib bumper liner are safer?

I have chosen a regular crib bumper but someone told me it’s a suffocation hazard for a baby and I googled it and there’s articles about it. What should I use to put in the crib to protect the baby from bumping or sticking his arms and legs out?

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