I saw a baby left alone in a car in a car park of a Sainsbury's, no one around, I was leaving the trolley to put my son in my car, and I noticed a baby in the car seat, alone in the car. I went inside the store a told security, then came out and felt very uncomfortable leaving like that, so I called 999. By the time I finished the call, I went back inside the shop to check if security tracked the parents, they didn't. Went back to the car, got a call from 999 asking me to call them if the parents came back, which a did a while later when the mother approached the car. Then she called the father and he arrived a minute later very angry at me for calling. I explained that I waited, no one showed up and I called, what if no one came back? What if, considering the windows were open, someone took the baby? Also, if they were 2 people, why didn't the mother stay in the car since the only needed bread apparently? Police arrived and I left after talking to them, but this father looked very angry. Did I do the wrong thing here? That baby was alone in the car for a good 30 minutes.