Cooing
Language acquisition device
Interactionists
Receptive language
Secondary circular reactions
Violation of expectancy
primary circular reactions
Telegraphic sentences
Tertiary circular reactions
Inflections
Expressive language
Holophrases
Lexical words
Means -end behavior
Infant directed speech
Deferred imitation
Babbling
object permanence
sensorimotor stage
Schematic learning
Naming explosion
Object individuation
object concept