A mother has called 911 for medical assistance. She states that her 3-month-old son has a rectal temperature of 99.7°F and is not feeding. Which statement would be appropriate when talking with the mother about the infant's temperature?

Lifespan development is the study of how people change and grow from conception to death. It involves three developmental domains: physical, cognitive, and psychosocial. 

Lifespan development includes five stages:
Infancy: From birth to one year old
Toddlerhood: From one to five years old
Childhood: From three to 11 years old
Adolescence: From 12 to 18 years old
Adulthood: After adolescence