This is a question for the religious people who are against abortion.

What happens to aborted fetus's? Do their souls automatically go to heaven?

If yes ...

Wouldn't it be the ultimate act of sacrifice for a mother to abort her child?

Think about it.

She is committing a grave sin so her child will go directly to heaven.
Because if she gives birth to her child, there is a good chance that her child might not accept the chosen religion, therefore be sent to burn in Hell for all eternity.

Chew on that contradiction for a while.