The helplessness of an infant is something most horror writers and directors wont even tread on. They know it is too much for some people to even try to fathom, so they don't touch it. For that reason, when someone does finally tread, it can be even more terrifying a thought because we so rarely "go there".
This leads us to Mockingbird. An amazing little horror short from the crew over at FEWDIO. It takes the idea of the helplessness of a child to new heights, all while never showing us a thing. Just using the simplicity of a haunting nursery rhyme and great sound design to drive the horror home. Don't worry, it's not gory. It's very disturbing, but not gory. When horror is this scary, it doesn't have to be gory.
I have said this about Fewdio's work before (seriously, go spend a few hours on their YouTube page after you spent a few hours here) and I will say it again: they do more with horror in two minutes than most full length, big budget, million dollar films. Hell, here they only needed a minute and a half.