According to the article The New Science of Mother-Baby Bonding on parenting.com, when a mother kisses her babe, "Pathogens on a baby's skin are carried from the mother's lips into her system, and she produces made-to-order antibodies that boost his immunity." How amazing! The way mothers' and babies' bodies continue to function as one organism even after birth is fascinating, and I never cease to be awed by the ways in which we've evolved to care for our children. Even kissing them serves a function.
I'll never feel guilty about showering Tye with kisses again.