i was told the same too after i purchased the bumpers. my plan is to just leave on when hes not in the crib. and when he is, to take it off.just for looks basically. only because i cant find my reciept😕lol
Sometimes the first time they roll over is at night in their crib before you even know. So it's better to avoid them all together. Not worth the risk but that's just me.
Then its just for looks, if you want, put it on... When your baby learns to roll over, take them off. Our daughter will never have one on her crib, but thats our choice