This is the very first Day at the start of the game. No doors have been locked (excluding the door between the Dining Room and the Backyard, and the door between the Jail Cell and the Baby Room; as these doors are always locked and only Granny can open them). The Player does not appear to be injured at all, despite the fact that the Player was most likely hit by Granny's bat and was dragged into the Starting Bedroom before the events of the game.
If the Player gets to Day 2, they will find that they wake up with a slight limp. And they will find that the door to the Starting Bedroom has been locked by Granny and the Player must lure her in to opening the door by making noise, whether it be by knocking the table over, dropping the vase that is on the table, or knocking over the painting. She will rush upstairs and unlock the door to investigate, leaving it unlocked after she leaves.
On Practise mode, due to Granny being absent from the House, the door will be unlocked.
The Player's limp has gotten more noticeable. The door connecting the Main Room and Bedroom 2 is now locked in its place and will stay locked through all future days until Granny is lured into unlocking it.
Once again, in Practise mode, this door will not be locked.
There is now blood visible on the screen and leaking on to the bed where the Player wakes up. There are no new locked doors today or on any future days.
This is the last day you have to escape unless you unlock the Bonus Day. Otherwise, if you get caught, you will get a Game Over.