Early in life, children are not capable of filling out a complete questionnaire or talking to an interviewer.
Knowledge is the key to developing a better understanding of autism. Researchers often observe and code behavior in combination with other research methods.
In infancy you can observe an explosive growth. Many researchers focus on this age group. Think about studies aimed at learning more about speech behavior, maternal sensitivity, or learning behavior in infancy.
Quality of parent-child interaction is one of the major predictors of emotional and social development of children, which makes parent-child interaction an important focus of child development research.