The answer is "the face".
Robert Fantz began estimating the measure of time babies spent taking a gander at something as an approach to check how keen on it they were. Fantz announced that a two-month-old child spent twice as long taking a gander at a portray of the human face as at a bullseye, for example. Tests in view of look estimations have been the field's workhorse from that point onward. It is no misrepresentation to state that without looking-time measures, we would know almost no about almost any part of baby improvement.
