There was a CSI episode from 2001 I think. A four month old baby was suffocated accidentally by his brother, and I was bawling. Anything with babies getting hurt makes me sick.
Another CSI episode, a woman and husband planned to kill their baby by leaving him in a boiling car. They thought he had a disease that a previous child of theirs had had, as he was starting to exhibit the same symptoms. They didn't wait for the test results, and just went ahead and suffocated him. Turns out, the baby wasn't sick at all. They killed their own kid for no reason.
An episode of House where an outbreak of an unknown infection is spreading through the babies of the hospital, and House and his team make a really controversial decision which is really a tearjerker. Killing one to save many is a message in that episode, if you get what I'm saying.
And, one more episode of House, a woman almost suffocated her baby in the bathtub. Eventually, once she is in the hospital, and supposedly okay, her husband brings her her baby to hold. The woman and baby are alone inthe room, and the woman starts to develop psychosis or something, and rolls over on her child. As soon as House sees from the outside of the room, he sprints in, trying to save the baby, but to no avail. That whole scene was so sad and intense, it was ridiculous- I skip watching this episode (And the other baby one) sometimes when I am re-watching House, as I feel that I can't always deal with the emotion the episodes evoke in me.