Water bed for babies

Ri

So scrolling the marketplace and see this. This person is legit trying to sell a water bed mattress for a baby! I looked her up she has to be in her 60s so she is selling the mattress her kids used roughly 30 years ago or more that's a water bed. This is frightening and I legit don't know if I should message her about the dangers or let it be.

Update: listing was taken down.