The only truth in this thinking is that it kills cats.
We get owner give ups in rescue all the time for this reason. Some come with the vets blessings.
Think of how many cats were just dumped at A/C or shelters who didn't stand a chance of getting adopted?

Can the owners Google:
myths about cats and babies

http://www.tulsa-animalshelter.org/t...%20infants.htm


As for the crib, make it off limits by closing the door, or buying a netting for overtop.