Bad smell coming from my bathroom sink.?

We just bought a house a few months ago and have an odor problem in our bathroom/laundry room. I did some sniffing around and realized the smell was coming out from the pedestal sink. It kind of smells like a litter box or vomit. It’s awful when the window has been shut. Any one have any ideas what it could be? Once the window is open and it airs out, the smell is pretty much gone. I tried using a bacterial drain and trap cleaner, which seemed to work at first, but now the smell is back. I have no idea what it could be.

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