The icing on the cake of that joke is Stan's baffled delivery of that line, somewhat sympathetic of Jeff's statement while just absolutely lost on the mechanics of it. Just gold.
You know what's sad? The fact we're to a point where it's actually a very very good idea to get a DNA test on the baby before taking them home. Not for infidelity, but in case the baby was swapped, both by accident or maliciously.
I'm trying hard to find a fact that its getting worse, but seems like the last research done on the temporary/permanently swapped babies was 1998, and the handling of babies has improved greatly since then.
Have you read something that makes it sound worse?
I didn't let my baby out of my sight the entire time my wife was recovering in the hospital. Absolutely not risking a swap or kidnapping, regardless of how likely or unlikely it is. I'd recommend everyone do that if it's feasible to have someone always watching the baby during cleaning and testing.