I'm not talking about for extended periods of time. I'm talking in general.
I admit, when we had my youngest, we forgot her twice. The first time, we were heading out to the store, got the older kids out, then just shut the door and got in the van and started to drive away. That's when we realized we didn't get the baby.
Then one time, we got out at Wal-Mart and we each other the other had gotten her.
People say they don't know how people forget their child in the car and, for an extended period of time, I don't get it either. But I HAVE forgetten one, even if for a split second. We are only human, after all.