Moral development focuses on the emergence, change, and understanding of morality from infancy through adulthood. Developmental delays are common in infancy and childhood. Many patients die in infancy and childhood. He had five children ranging in age from infancy to 14. They had seven children, though only five survived infancy. His parents had two other children who died in infancy. Lillian had given birth to a daughter who died of pneumonia in infancy. The lowest levels occur in infancy and old age. Of their many children, only three survived infancy. They had four children, of which the youngest two survived infancy. He was the youngest of seven children, five of whom died in infancy. In&colon; Hematology of Infancy and Childhood. John was the eldest of the five children who survived infancy. His parents had already had a number of children die in early infancy. They had four children, two of whom died in infancy.