I was at a local grocery the other day, a small one with two checkout aisles. One cashier was working.
A mother came in with a stroller. She pointed out to the cashier that the stroller's bottom rack was already heavy with groceries. The woman was just grabbing something quick, and didn't want the cashier to charge her for the stuff on the bottom.
"Leave your baby up here with me," said the cashier. "I'll watch her." And so the mom did just that. She left the baby in the care of the grocery store cashier and disappeared into the store. I was gone before she finished shopping. But I'm sure the baby was perfectly safe.