Answer:
According to the New York Longitudinal Study, at 3 months of age can infants' temperaments first be classified?.
Explanation:
New York Longitudnal Study includes the investigations of the direct observation and interviews with the parents about their children.
It was started in 1960s.
By 3 months they found four categories of temperament :
1) Easy
2) Difficult
3) Slow-to-warm-up.
4) Hard to classify.
Hence According to the New York Longitudinal Study, at 3 months of age can infants' temperaments first be classified
