Don't sit your infant carrier on the floor in public!
The lady in front of me with the infant carrier sets the carrier on the floor beside her. The old lady paying in front of her takes a step backwards, when she did she tripped over the infant carrier and fell directly on top of the newborn, she had no idea the carrier was there. Old lady is hurt, baby is hurt, everyone is screaming at each other. Ambulance had to be called, both old lady and newborn went to the ER.
While out in a public place, do not sit your infant carrier on the ground!