Tony Blair makes a hilarious and true insight into the stages of the development of persons from infancy to adulthood, in his autobiography, A Journey – My Political Life:

“Except to the doting parents, babies are frankly pretty boring – sweet and cuddly, but still a bit inanimate…. From about age three onward, they get interesting and remain like that up to around age twelve, when the dark mists of hell envelop them. Unbelievably, they emerge again as semi-civilized human beings around the age of twenty, you stop thinking you are a bad parent or there is genetic delinquency in the family, and realize they are still your children and you love them.”