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The First Smile A Developmental Study
Author(s) -
SÖDERLING BERTIL
Publication year - 1959
Publication title -
acta pædiatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/j.1651-2227.1959.tb05411.x
Subject(s) - medicine , developmental stage , pediatrics , developmental psychology , psychology
Summary In a series of 400 healthy infants of normal weight at birth 70 % smiled between 3 and 5 weeks, none before 2, all before 6 weeks. The date of the first smile would seem to give correctly the developmental stage. The origin of the smile is discussed.