Why do scores on infant developmental scales appear to be such poor predictors of later IQs?

Question

Quizplus · Accepted Answer

Infant developmental scales may tap qualitatively different abilities than those assessed by later IQ tests. Early childhood development involves rapid changes and growth in multiple domains, including motor skills, social-emotional development, and language development, among others. IQ tests, on the other hand, tend to be more focused on cognitive abilities such as abstract reasoning and problem-solving, which may not be fully developed or measurable in infancy. Therefore, the scores on infant developmental scales may not necessarily predict later IQ scores accurately.

Why Do Scores on Infant Developmental Scales Appear to Be