Easy to understand Bedroom Pouch binding of isaac faded polaroid Sobriquette Deform To jump
Apparently gulping the faded Polaroid makes it unable to open the door in depths which I guess makes sense since you can't put it in the door if you swallowed it :
The Ten Best Trinkets in "The Binding of Isaac: Rebirth" - LevelSkip
Faded Polaroid Use : r/bindingofisaac
The Binding of Isaac: Rebirth - How To Unlock The Planetarium [Repentance DLC] - Steam Lists
The Binding of Isaac: Repentance - The Easiest Way to Unlock The Planetarium