There is no stalking by someone obsessed with another person, or anything similar. Someone voted yes, but I think they are referring to being "stalked," or rather hunted, by a monster.
You do not see a baby, but you hear it cry in episode 1. In episode 3, it is revealed a baby was killed, but no details of the death are given. The baby's clothing is shown, but it does not have any signs of violence.
Not buried underground, but a metal box is opened, revealing a prisoner that had been kept in there (amount of time unknown). The box was small enough that the person would have had their back and knees bent in order to fit. You do not see the person put in the box and would not know they were in it until it is opened. Skip 11:10 to 11:50, this gives you an extra 5 seconds or so on either end to make sure you don't see it.