Overview
Rebirth will feature local two player co-op, but no online multiplayer as to avoid extending the development time (although Ed has expressed interest in adding this feature in the future). The second player can join in at any time as a random “Baby”, taking a heart container away from Isaac and giving it to the second player. Subsequent presses of the start button will give more heart containers to the second player, and Isaac will lose them accordingly.Soul Hearts will be given to Player 2 before normal hearts, and half hearts will be given before full hearts. If player 2 dies, they can rejoin the game at the cost of another heart container, as a new random Baby.The appearance of many of the Babies is solely cosmetic, but there are a number of “special” Babies. In order to stop things from becoming too overpowered, every special Baby has a “cursed” Baby counterpart.Aside from normal, special and cursed Babies, Rebirth will also feature a full set of unlockable Babies that are tied to specific characters. For example, Maggy will have a higher % chance of generating a Maggy themed Baby once you have unlocked it.
Baby
Meat Boy Baby
Made to look like Super Meat Boy.
Donatello (Ninja Turtle) Baby
Green with a purple ninja mask.
Spelunky Baby
Made to look like the Spelunker from Spelunky
Dry Baby
Damages all enemies in a room similar to the Necronomicon’s effect when it gets hit by red projectiles or bones
Bloody Baby
Leaves a trail of blood that damages enemies.
Rotten Baby
Fires attack flies.
Magnet Baby
Shiny silver baby that attracts consumables similar to the magnet
Mongo Baby
Copies the abilities of other babies in your group. (Haven’t tested multiple
babies)
Water Baby
Explodes in to tears when it dies.
Troll Baby
The Baby will randomly spawn troll bombs every 1-2 minutes, which can hurt either Isaac or the Baby.