The branch of psychology that studies the social and mental development of children(noun)
WordNet. Princeton University. 2010.
Use "child psychology" in a sentence
"Bowlby’s application of child psychology to adult grief attracted the attention of psychiatrist Colin Murray Parkes who worked at the first hospice in the Western world, St. Christopher’s in London and who joined Bowlby’s research unit at Tavistock Clinic."
"Dr. Kutner is the author of five books about child psychology and wrote the award-winning weekly New York Times “Parent & Child” column from 1987 to 1994."