Macduff is the bloody baby because he was not born from a woman. His mother died before she could have him naturally so they had a C-section/killed the mother.
Where is Macbeth going when he sees the bloody dagger?
Lady Macbeth returns the bloody daggers (two of them) to the grooms in Duncan's chamber. Macbeth cannot face doing it.
Macbeth kills the grooms so they cannot tell the others the truth.
Where is Macbeth going when he sees the bloody dagger?
In an apparition, the three witches show Macbeth a bloody child that is meant to symbolize the just-born Macduff.
A bloody child.
The bloody man is a sergeant who describes Macbeth's bravery in battle to King Duncan. He reveals Macbeth's triumphs in fighting against the traitorous Macdonwald and the Norwegian forces, highlighting Macbeth's skill and courage in combat.
The bloody sergeant.
malcolm
Lady Macbeth takes the bloody dagger back to Duncan's room in order to frame the King's guards for his murder.
After Macbeth sees the bloody dagger, he is headed to King Duncan's chamber to carry out the murder as he believes it is a sign from fate urging him to proceed with his plan.
He has forgotten that he is holding it. He is in a state of shock and does not fully understand what he is doing.