Is it true that using the automatic swinging yao lan (sarong) can cause damage to the baby brain due to constant swinging motion?

I dont think so? Except they might be too used to the shaking, so whenever they want to slp u might have to soothe them by rocking non-stop? I think the only concern is when they are learning to turn, watch out if they turn in a way causing them to be caught somewhere and cant breathe?