||Spoiler Alert! This article describes a subject that is sensitive to plot development.
The final still scene from
Ocarina of Time
The Child Ending is one of three endings of Ocarina of Time, which causes the series continuity to branch off into the Child Timeline.
After defeating Ganon and returning peace to Hyrule, Princess Zelda plays the Ocarina of Time, warping Link back to the past. Young Link witnesses Navi depart through the window of the Temple of Time. He then goes to the Hyrule Castle Courtyard to see Zelda in her younger incarnation.
Two years later, Link treks through the Lost Woods in search of Navi. He is ambushed by the Skull Kid wearing Majora's Mask, thus setting in motion the events of Majora's Mask and the Child Timeline.
Subsequent Games in the Timeline
Link realises he's a child again