What are some examples of little kids/babies getting killed in horror flicks?

[WingedSerpent]

A kid gets eaten by one of the monsters in Feast

one kid is killed off screen by the Ro-Man in Robot Monster

[indianasmith]

A seven year old boy is killed and partially eaten at the beginning of WER.

[WingedSerpent]

A little kid gets a chestburster in Alien vs Predator: Requiem.  Off screen of course.

And Rayne finds the body of one in Bloodrayne

Two kids at the beginning of the first Mimic

[Rev. Powell]

Frankenstein (1931)

Good one, probably the earliest example. Even though nothing was shown, that death was quite controversial at the time and was cut out of prints shown in some states.

[retrorussell]

BURNT OFFERINGS
The son of Oliver Reed and Karen Black's character is crushed by a crumbling chimney at the end.

[JaseSF]

M (1931) deserves to be mentioned in this thread. Also Never Take Candy From a Stranger...

[Trevor]

Not a horror movie but a baby is impaled in Uwe Boll's Darfur. I actually screamed when that happened.