Do you know what happens when you stab a baby in the head? An erection and a place to put it.
It's very offensive to make jokes like this, especially about a baby.
It is normal to joke like this on these types of sites.
I hope that you don't make jokes like this offline, because rape and murder with a baby is one of the worst things someone could joke about.  There's really nothing for you to gain by trying to shock people like this, so I hope you can find a more positive way to use your time.
No, It is okay to joke about this, babies love to be stabbed in the head.
There is nobody who likes being stabbed in the head. There might be people on this site who like to tell offensive jokes, but in the real world joking about rape is not acceptable.  I hope you realize that you shouldn't be telling these things to other people