Don’t Touch Our Baby’s Face Or Hands – Leo and Rebecca Buzz Question

Leo and Rebecca Buzz Question - We just had our first child...she's a newborn and we've had lots of visitors lately. The other day my wife told a family member DON'T TOUCH OUR BABYS FACE OR HANDS. She says it to everyone. I'm kind of embarrassed about it. I get the whole germ thing but isn't this excessive?