The Terrible Twos and the Trusting Threes -- Film Description:
"A study of child behavior at two and three years, showing what to expect and how parents can deal constructively with the problems they present. The film shows a group of active children in playground, nursery school and home, first at age two, and then at three. Destructiveness, tantrums, rivalry with younger children, and unreasonable fears are discussed."
-- National Film Board of Canada

Source:
National Film Board of Canada. "NFB -- The Terrible Twos and the Trusting Threes" National Film Board of Canada. http://www3.nfb.ca/collection/films/fiche/?id=10430.