Development Of The Smile And Fear Of Strangers In The First Year Of Life (1963)
Shows the development of the smile and of the fear of strangers during the first year of life in identical and fraternal twins. Points out that identical twins show greater concordance. Infants become more selective as they grow, smiling only at familiar persons and being afraid of strangers.
Higher quality versions of this film can also be licensed for stock footage. Contact firstname.lastname@example.org for more information. Buy this film on DVD.