Final answer:
The major scales used in measuring infant development are the Bayley Scales of Infant and Toddler Development and the Griffiths Mental Development Scales. Habituation assessments involve measuring an infant's response to a repeated stimulus and are used to predict later intelligence.
Step-by-step explanation:
The major scales used in measuring infant development are the Bayley Scales of Infant and Toddler Development and the Griffiths Mental Development Scales. These scales assess various aspects of infant development such as cognitive, motor, and social-emotional skills.
Habituation assessments involve measuring an infant's response to a repeated stimulus. If the infant becomes habituated, or bored, with the stimulus, their response will decrease over time. This can be used as an indicator of cognitive processing abilities and is thought to predict later intelligence.