From a print ad from Cotton Incorporated ("The Fabric of Our Lives"): "Nothing complements imperfect genes like the perfect jeans."
At the birth of a baby, most parents will focus on the baby's health, experiencing relief when genetic disorders, congenital conditions, etc. are ruled out. The baby has all its reflexes and 10 finger and toes? Perfect. So, why are "a few extra pounds" considered imperfect later on?