Found a great column on the topic at Ammo Grrrl. Ex:
I read a pretty amusing description of the difference between the parents’ protocol with the first child and the subsequent children. With the first child, when she drops her pacifier, you boil it. With the second child, you run it under the faucet for a few seconds to remove any visible dirt. With the third child, you have the dog fetch it.
So all you secondary, tertiary, and etc. kids out there, remember that your parents didn't actually favor their first born over you, they just didn't know any better. As a result, I suppose the much better developed immune system of the younger siblings probably means that today they're only fractionally as likely to catch the Wuhan Flu.