Yes Mother?

Transformations

Guppy	Beelzebub	Super Bum	Yes Mother?	Bob	Fun Guy	Leviathan	Conjoined
Spun	Seraphim	Oh Crap	Bookworm	Spider Baby	Adult	Stompy

Isaac turns into his mom after picking up any three distinct items in the following list. In this form, Isaac gains a stationary Mom's Knife that trails behind Isaac as he moves, dealing 2x Isaac's tear damage on contact. The knife synergizes like Mom's Knife would.

Activated Collectibles

Name	ID	Icon	Quote	Description
Mom's Bottle of Pills	102		Reusable pill generator	Gives Isaac a random pill, and will cause him to drop any held Q-slot item (If any). The player will only receive six different pill types in one playthrough.
Mom's Bra	39		Mass Fear	Upon use, petrifies all enemies in the current room for approximately 4 seconds.
Mom's Pad	41		Gross...	Upon use, inflicts fear to all enemies in the room for 5 seconds.
Mom's Shovel	552		Lost but not forgotten	Spawns a trapdoor that leads to the next floor upon activation. Unlocks The Forgotten when used on a mound of dirt that appears in Dark Room.

Passive Collectibles

Name	ID	Icon	Quote	Description
Mom's Coin Purse	195		What's all this...?	Spawns 4 random pills around Isaac.
Mom's Contacts	110		Freeze effect	Adds a chance to shoot petrifying tears, which stop enemies in place and prevent them from moving or attacking. Range up.
Mom's Eye	55		Eye in the back of your head	Allows Isaac to fire tears from the back of his head.
Mom's Eyeshadow	200		Charm tears	Tears have a chance to charm enemies.
Mom's Heels	30		Range up	Increases range.
Mom's Key	199		Less is now more +2 keys	Spawns 2 keys. Generates additional pickups from chests.
Mom's Knife	114		Stab stab stab	Isaac's tears are replaced by a knife that pierces enemies, can travel through obstacles and can hurt enemies while Isaac is holding it. Holding down the fire button before firing increases its range and power.
Mom's Lipstick	31		Range up	Increases range and shot height.
Mom's Perfume	228		Fear shot	Adds a chance to shoot fear tears and decreases tear delay by 1.
Mom's Purse	139		More trinket room	Allows Isaac to hold 1 additional trinket.
Mom's Underwear	29		Range up	Increases range.
Mom's Wig	217		You feel itchy...	Adds a chance to spawn blue spiders when firing tears. Restores 1 red heart.
Mom's Pearls	355		Range + luck up	+1.25 Range Up. +0.5 Tear Height. +1 Luck Up.
Mom's Razor	508		It's sharp!	Spawns an orbiting razor that damages enemies it touches and inflicts bleeding on enemies, causing them to slowly take damage over time.

Notes

• This is a reference to the horror film Psycho.
• Mom's Box does not count towards this transformation even though it has the name "Mom" in it.

Unlockable Achievements

• 

  Mom's Contact - Obtain three Yes Mother? items in one run.

Gallery

• 

  Concept art for the Mom transformation.

• 

  Concept art of the Yes Mother transformation (labeled "Mom") and other transformations for the Afterbirth DLC by Edmund McMillen.

Trivia

• The Yes Mother? transformation resembles the original Flash costume for Mom's Knife.