Very interesting article from CNN. While I never put Abigail in her car sear FOR a nap in the home...if we drove somewhere and she was asleep, I always let her go until she awoke...until she was old enough to be a regular crib napper.

I was more concerned about her being able to stretch out and not get too warm...but this is the first I've heard of oxygen levels for infants.

http://www.cnn.com/2009/HEALTH/08/24/car.seat.blood.oxygen/index.html