Superstitions

What , if any superstitions do you and/or you family members believe in??
My husbands family believes that when you take baby home from the hospital they have to be wear yellow for good luck. I complied as a first time mom and my child is now 3 and doing well.  Lol I know them seem silly but I figured why not?  Now with a second baby on the way I plan on doing the same since I guess with my first it did bring us luck. 
What are your superstitions for pregnancy or once your child is here?