i find this, disturbing

I found 'these' items spread out on the kitchen counter this evening. I am absolutely dumbfounded at the moment. I live with two girls, and a couple. No pets, and definitely, no babies. So why the bottles? I can only imagine. They were not only baby bottles, but 'kiddy' type of bottles, the ones with cartoon characters on them, not forgetting the cover.

At this point I don't even know if I should laugh, or panic. Are one of my housemates keeping an animal in the house that I am not aware of? Or is someone here trying to raise a family? Or worse.... okayyyy... forget it. Or are they?

This is starting to creep me out.