How many diapers does a baby use in a lifetime?

National Geograchic did a study that said the average American uses 3796 in a lifetime.

I find that number to be very light, if the average baby is potty trained at 2 1/2 years 3796 would be only 4 diaper changes per day. At 6 diapers per day for 2 1/2 years a closer number will be 5,475 - even that is a short estimate.

This is probably because the number is an average. I'm assuming that you're talking about disposable diapers, and some people use cloth diapers.