The Dry Baby is a passive item in The Binding of Isaac: Rebirth (TBOIR)
Effects
When you pick Dry Baby up, you get a Familiar that follows you around and blocks shots from monsters
Of the Dry Baby gets hit by an enemy shot, it has a chance of activating the Necronomicon effect, dealing damage to all monsters in the same room.
Character Appearance
Character has a gray, one legged baby, following him: