When playing with your child, some common sense is in order. After eating, for example, is not the best time for bouncy play.
That's fairly logical, but there's a derivative from this: after eating (up to, say, an hour after), avoid any play that places the child's head directly above your head.
As a newly washed car is to a bird, so your face, with it's stupid, wide-open-mouth smile, is to your child...