We’ve all seen it and many of us have done it. The infant is asleep and we don’t want to wake him or her so we just unbuckle the car seat and leave the child in the car seat to nap while we go about our business.
Truth is that infants die each year because of this practice. The problem is generally that the straps choke them or they die of asphyxiation because their body slips into a position where breathing is difficult.
The bottom line is that a car seat is intended for the child to sit in and sleep while in a vehicle. If used in this manner, the child is under constant supervision. Never leave a child in a car seat unsupervised, even for a couple of minutes.