The empty Stroller and the pink Sock

"I was in a crowded place with a baby, but I don't know whose baby it was. I remember holding her and being very careful, even though I couldn't see her face clearly. I put her down in a stroller while I looked for something in my bag. It was probably a bottle or a blanket. When I turned around, the stroller was empty. I started asking everyone if they had seen her. People kept walking past me, and one woman told me to check the information desk. I ran there, but instead of an employee, there was a pile of lost shoes. Then I was suddenly in a house I didn't recognize. I could hear the baby crying upstairs, so I ran up the stairs, but every room was empty. The crying stopped whenever I opened a door. I found a tiny pink sock on the floor and held it in my hand. I kept thinking I should know where it came from, but I couldn't remember dressing the baby. When I went back downstairs, the stroller was sitting by the front door. The baby was inside, asleep, and completely safe. I picked her up and started crying so hard that I woke up."