Baby

Chapter: 6 · House Beneviento
Where: House Beneviento B1: the corridors of the Doll Workshop, Medicine Room, Study, Bedroom and Elevator Hall.

Weak point

None. It is a hallucination: you have no weapons and it swallows you whole (instant death).

A weaponless chase in three encounters. It turns poorly and gets clumsy in corridors, but its lunge is fast. Listen to it: it sounds happy while chasing you and upset when it has lost you. Don't let it see you get into a hiding place.

Reward

None: the elevator takes you up to the hide-and-seek with Angie (Donna Beneviento).

It has no HP: it can't be damaged. Same on every difficulty.

Speedrun trick (unconfirmed on Switch 2): wait outside the kitchen door until its front-left leg reaches the basement floor, then go back in; its lunge misses and you slip past.

Step by step

Encounter 1 (with the Breaker Box Key): it appears at the end of the Doll Workshop corridor. Wait behind the Doll Workshop table until it comes in, then go round the opposite side. Reach the breaker box by the elevator, use the key and take the Relief of a Child.
Crawl back through the gap. If you are too quick it may be waiting at the exit: wait a moment. Placing the relief in the door with the depression despawns it.
Encounter 2 (the Bedroom Fuse): the lights go out and it blocks the stairs. Run to the Bedroom and hide under the bed (or in a tall closet). When it passes, sprint. Bookshelves now block the crawl space: go the long way through the Medicine Room, where it despawns.
Encounter 3 (the elevator): put the Fuse in the elevator box and it comes round the corner at you. Lead it around the couches and the projector table in the Study, then run for the elevator, which opens by itself when you stand in front of it.
Press the button inside immediately. In the cutscene it just misses.