Answer:
There are only three apparitions in Macbeth.
1. A helmeted head. He is just a head with armor on, he tells Macbeth that he is supposed to "beware Macduff."
2. A bloody child. This is meant to symbolize Macduff as a just-born infant. This apparition tells Macbeth that he only needs to fear those who are not of woman born. Meaning those who are not born naturally from a woman.
3. A crowned child with a tree branch. Again this is meant to symbolize Macduff. This apparition tells Macbeth that he doesn't need to worry until the forest at the bottom of the hill that his castle is on begins to move up the hill.