You were a tiny human that somehow got to Waterfall.When you were walking through the marsh parts there was a Temmie saying how much her temmie flakes are better than normal food.

"Uhhhh nOO! I knOws it hEalS bEtteR!"

She then turned around and noticed a teeny tiny little YOU.

"Awwww sO COOT!1!"

She didn't know what to do so she put you in her sweater and started carrying you close to her.